Geometry
GMT8836 ccs
Basic Geometry

Learn the basics of geometry—the core skills you'll need for high school and college math. From Khan Academy

Lines - Basic Geometry

Learn what lines, line segments, and rays are and how to use them.

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Terms & labels in geometry

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Identify rays, lines, & line segments Interactive ...

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Drawing parallel line segments

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Parallel & perpendicular lines intro

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Parallel and Perpendicular Lines

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Assessment: Identify parallel and perpendicular li...

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Lines, line segments, and rays

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Draw rays, lines, & line segments - interactive pr...

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Lines, line segments, and rays review

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Draw parallel and perpendicular lines - Practice

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Parallel and perpendicular lines review

Angles - Basic Geometry

In this topic, we will learn what an angle is and how to label, measure and construct them. We will also explore special types of angles.

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Angles: introduction

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Complementary and supplementary angles (visual) - ...

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Measure Angles Interactive Assessment

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Angle Basics - Practice

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Naming angles

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Name angles - interactive practice

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Angle measurement and circle arcs

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Measuring angles in degrees

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Measuring angles using a protractor

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Measuring angles using a protractor 2

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Constructing angles

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Assessment: Draw angles

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Acute, right, & obtuse angles

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Assessment: Angle types

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Recognizing angles

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Drawing acute, right and obtuse angles

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Assessment: Draw right, acute and obtuse angles

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Assessment: Recognize Angles

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Assessment: Benchmark angles

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Parallel and Perpendicular Lines

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Vertical angles

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Assessment: Vertical angles

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Angles, parallel lines, & transversals

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Missing angles with a transversal

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Assessment: Angle relationships with parallel line...

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Identifying an angle

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Identifying supplementary, complementary, and vert...

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Measuring angles review

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Constructing angles review

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Angles in circles - Practice

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Angle types review

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Complementary and supplementary angles review

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Vertical angles review

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Angle basics review

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Complementary and supplementary angles (no visual)...

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Measuring angles with a circular protractor

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Angles in circles word problem

Shapes - Basic Geometry

Classify shapes and solve problems using what we know of the properties of shapes.

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Find angles in triangles - Practice

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Compare Shapes - Interactive Practice

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Cousin Fal's Shape Collection (Identifying Shapes)

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Assessment: Name shapes 4 ( recognizing shapes)

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Categorize quadrilaterals - Interactive Practice

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Intro to Quadrilaterals

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Quadrilateral properties

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Quadrilateral types

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Classifying Triangles

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Worked example: Classifying triangles

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Assessment: Identify triangles by side lengths

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Classifying shapes by line and angles types

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Assessment: Classify shapes by line and angle type

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Triangle exterior angle example

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Worked example: Triangle angles (diagram)

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Triangle angle challenge problem

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Triangle angle challenge problem 2

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Assessment: Finding angle measures between interse...

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Quadrilaterals: Kites as a geometric shape

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Assessment: Quadrilateral types

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Classifying quadrilaterals

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Assessment: Properties of shapes

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Recognizing Shapes

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Angles in a triangle sum to 180° proof

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Classifying triangles by angles

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Finding angle measures using triangles - interacti...

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Name shapes 3 - Practice

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Polygons review

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Identify triangles by angles - Practice

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Types of triangles review

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Find angles in isosceles triangles - Practice

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Triangle angles review

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Right angles in shapes (informal definition)

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Identifying quadrilaterals

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Identify parts of 3D shapes - Practice

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Identify geometric solids (3D shapes) - Practice

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Identify quadrilaterals - Practice

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Classifying shapes by lines and angles

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Counting faces and edges of 3D shapes

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Recognizing common 3D shapes

Coordinate Plane - Basic ...

We use coordinates to describe where something is. In geometry, coordinates say where points are on a grid we call the "coordinate plane". From Khan Academy Basic Geometry

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Intro to the coordinate plane

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Points on the coordinate plane examples

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Plotting a point (ordered pair)

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Quadrants of the coordinate plane

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Points and quadrants example

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Assessment: Quadrants on the coordinate plane

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Finding the point not graphed

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Assessment: Points on the coordinate plane

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Coordinate plane word problem examples

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Assessment: Coordinate plane problems in all four ...

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Reflecting points in the coordinate plane

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Reflecting points in the coordinate plane - intera...

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Drawing a quadrilateral on the coordinate plane ex...

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Drawing polygons with coordinates - Interactive Pr...

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Assessment: Quadrilateral problems on the coordina...

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Graph points - Interactive Practice

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Coordinate plane graphing word problem - Naomi wa...

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Assessment: Coordinate plane word problems (quadra...

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Coordinate plane: graphing points

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Coordinates of a missing vertex

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Area of a parallelogram on the Coordinate Plane

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Dimensions of a rectangle from coordinates

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Coordinates of a rectangle example

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Points on the coordinate plane

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Coordinate plane parts review

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Graphing coordinates review

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Quadrilateral problems on the coordinate plane

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Coordinate plane word problems practice (quadrant ...

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Graph points review (positive numbers only)

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Area and perimeter on the coordinate plane - Pract...

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Example of shapes on a coordinate plane

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Plotting corners of a rectangle

Area and Perimeter - Basi...

Area and perimeter help us measure the size of 2D shapes. We’ll start with the area and perimeter of rectangles. From there, we’ll tackle trickier shapes, such as triangles and circles. From Khan Academy Basic Geometry.

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Intro to area and unit squares

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Measuring rectangles with different unit squares

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Counting unit squares to find area formula

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Find area with partial unit squares

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Transition from unit squares to area formula - Int...

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Perimeter: Introduction

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Perimeter of a Shape

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Area of triangles - Interactive Practice

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Assessment: Area of parallelograms

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Area of trapezoids

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Area of kites

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Assessment: Area of trapezoids - Interactive Pract...

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Finding area by rearranging parts

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Area of composite shapes

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Area of composite shapes - Interactive Practice

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Area of squares and rectangles - Interactive Pract...

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Circles: Radius, diameter, circumference, and Pi

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Labeling parts of a circle

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Assessment: Radius and diameter

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Area of a circle

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Assessment: Area of a circle

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Finding circumference of a circle when given the a...

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Area Challenge - Interactive Practice

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Find perimeter when given side lengths - Interact...

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Find perimeter by counting unit squares - interact...

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Find Area by Counting Unit Squares

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Area of a parallelogram

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Area of a triangle

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Area and Circumference of Parts of Circles

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Measuring area with partial unit squares

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Creating rectangles with a given area 1

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Creating rectangles with a given area 2

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Create rectangles with a given area - Practice

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Transitioning from unit squares to area formula

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Finding missing side when given area

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Find a missing side length when given area - Pract...

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Area of rectangles review

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Finding perimeter when a side length is missing

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Finding missing side length when given perimeter

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Find a missing side length when given perimeter - ...

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Perimeter review

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Area of parallelograms - Interactive resource

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Area of triangles - Interactive resource

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Radius, diameter, & circumference

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Circumference review

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Area of circles review

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Circumference of a Circle - Practice

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Find missing length when given area of a parallelo...

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Find base and height on a triangle - Practice

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Area of right triangles - Practice

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Find missing length when given area of a triangle ...

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Find perimeter by counting unit squares - Interact...

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Finding height of a parallelogram

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Finding area of triangle

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Triangle missing side example

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Relating circumference and area

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Partial circle area and arc length

Volume and Surface Area -...

Volume and surface area help us measure the size of 3D objects. We’ll start with the volume and surface area of rectangular prisms. From there, we’ll tackle trickier objects, such as cones and spheres. From Khan Academy Basic Geometry.

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Volume and surface area word problems - Practice

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Volume of a rectangular prism: fractional dimensio...

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Assessment: Volume with fractions

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Volume with fractional cubes

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Volume of a rectangular prism: word problem

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Assessment: Volume word problems: fractions & deci...

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Intro to nets of polyhedra

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Assessment: Nets of polyhedra

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Surface area using a net: rectangular prism

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Assessment: Surface area

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Cylinder volume & surface area

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Volume of a sphere

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Volume of a cone

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Volume intro

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Measuring volume as area times length

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Assessment: Volume with unit cubes 1

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Measuring volume with unit cubes

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Volume of a rectangular prism

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Assessment: Volume 1

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Surface area using nets - interactive practice

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Surface area using a net: triangular prism

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Surface area of a box (cuboid)

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Surface Area of a Box Using Nets

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Volume of Spheres - Practice Assessment

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Volume of rectangular prisms review

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Volumes of cylinders - Practice

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Volume formulas review

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Volume formula intuition - Interactive resource

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Volume with cubes with fraction lengths - Practice

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Volume by multiplying area of base times height - ...

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Surface area review

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Volume of cones - Practice

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Volume of cylinders, spheres, and cones word probl...

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How volume changes from changing dimensions

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Surface area word problem example

Pythagorean theorem - Bas...

The Pythagorean theorem describes a special relationship between the sides of a right triangle. Even the ancients knew of this relationship. In this topic, we’ll figure out how to use the Pythagorean theorem and prove why it works. From Khan Academy Basic Geometry.

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Intro to the Pythagorean theorem

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Pythagorean theorem word problem: fishing boat

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Pythagorean theorem example

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Pythagorean theorem word problem: carpet

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Assessment: Use Pythagorean theorem to find right ...

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Distance formula

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Assessment: Distance between two points

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Garfield's proof of the Pythagorean theorem

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Bhaskara's proof of the Pythagorean theorem

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Pythagorean theorem proof using similarity

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Another Pythagorean theorem proof

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Pythagorean theorem challenge - interactive practi...

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Pythagorean theorem in 3D

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Pythagorean theorem in 3D - interactive practice

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Distance formula

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Distance formula review

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Pythagorean theorem intro problems

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Use Pythagorean theorem to find isosceles triangle...

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Right triangle side lengths - Practice

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Use area of squares to visualize Pythagorean theor...

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Use Pythagorean theorem to find area and perimeter...

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Pythagorean theorem word problems

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Use Pythagorean theorem to find area of an isoscel...

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Finding distance with Pythagorean theorem

Transformations, congruen...

Learn about geometric transformations and how they're used to understand the meaning of "similar" and "congruent". From Khan Academy Basic Geometry.

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Intro to reflective symmetry

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Assessment: Identify lines of symmetry

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Dilating shapes: shrinking

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Rigid transformations intro

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Performing translations

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Translate points - interactive practice

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Performing rotations

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Rotate points - interactive practice

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Performing reflections

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Reflect points - interactive practice

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Congruent shapes & transformations

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Similarity & transformations - interactive practic...

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Side lengths after dilation

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Similar shapes & transformations

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Translations review

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Rotations review - Interactive Resource

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Reflections review

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Draw lines of symmetry and symmetrical figures - P...

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Symmetry review

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Identify symmetrical figures - Practice

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Identifying symmetrical figures