# Geometry

Geometry (X)

## Interpreting a Scale Drawing: the Scale Factor

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Understand how a scale drawing is converted into real numbers using the scale factor.

## Cross-Sections of 3D Objects: Vertical Slice of a Rectangular Pyramid

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What happens when you slice vertically into a rectangular pyramid? What kind of geometric shape results?

## Complementary and Supplementary Angles: Find the Measure of Supplementary Angles

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Watch and learn how to find the measure of two angles whose sum is 180 degrees, or supplementary angles.

## Pythagorean Theorem

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Learn why the Pythagorean theorem works for finding side lengths of right triangles. This video focuses on modeling what the Pythagorean theorem actually means and why it will find the missing side of a right triangle. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers.

## Congruent vs Similar Triangles

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Learn about the characteristics required for congruent or similar figures. This video focuses on the variety of ways you can use the side and angle measurements of two triangles to check for congruence and also briefly discusses how that differs from similar figures. This video was submitted through the Innovation Math Challenge, a contest open to professional and nonprofessional producers.

## WorkKeys Applied Mathematics | Level 5

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Level 5 of the WorkKeys Applied Mathematics assessment requires learners to solve multi-step problems. These videos and worksheets are designed to help learners apply mathematical reasoning, critical thinking, and problem-solving techniques to work-related problems.

These resources are part of KET’s Applied Mathematics: Resources for WorkKeys® and GED® Preparation collection.

## Volume of Cones, Cylinders, and Spheres: Volume of a Sphere

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Learn how to find the volume of a sphere.>

## Rotation and Dilation

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In this video from KCPT, watch an animated demonstration of rotating and dilating a triangle on the coordinate plane. In the accompanying classroom activity, students watch the video; draw rotations and dilations of a triangle; and identify center of rotation, angle of rotation, and scale factors in classmates drawings. To get the most from the lesson, students should be comfortable graphing points on the coordinate plane and reproducing a drawing of a geometric shape at a different scale. Prior exposure to rotation and dilation is helpful.

## The Angle on Pool

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Investigate how players think about angles in the game of pool. This video focuses on how using forward and reverse spin effects the rebound angle of the cue ball and how angles help to correctly aim your bank shot taking math out of the classroom and into the real world.

## Measurement: Area

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In this video, viewers learn how to calculate area. Area is the measure of the surface inside a flat figure. Area is measured in square units. Multiply the length times the width to get the square units.

This video segment is from the GED Connection "Measurement" video.