Three angles of one triangle are equal to the corresponding angles in another triangle. Use a ratio of corresponding sides to find the scale factor. Actually, there are two scale factor values. The instructor will explain how to get both...

Similar figures have the same shape, the same corresponding angles, but different lengths of their corresponding sides. The teacher explains just what all that means. She demonstrates how to compare the two shapes to prove they are similar.

Similar figures have corresponding sides and corresponding angles. With this in mind, missing values can be found by using a scale factor. Not sure how to do that? Watch this video as the instructor illustrates how to set up the known...

Two similar triangles have the same angles, but their legs have different lengths. This means their angles are congruent, and thusly, their corresponding sides are congruent. So there is a missing measurement that needs to be found. Set...

Duane demonstrates how to find a missing length in figures that are similar. In this example he uses two similar triangles.

This QuickTime movie applies the concept of proportion to similar geometric figures. As you watch and listen to the teacher and students interact it helps clarify the thinking behind applying this concept. Allow loading time.

This lesson defines the phrase similar figures. It is 5 of 6 in the series titled "Similar Figures."

Video tutorial delves into how to find a missing measurement on similar figures by using proportions. [6:22]

Two figures that are the same shape and have the same angle measurements are similar figures. Learn all about them in this tutorial. [7:22]

Video tutorial explains how to identify corresponding parts in similar figures. [6:28]

In this video tutorial students explore a proof using similar triangles.

In this video tutorial [7:00], students will explore corresponding parts of similar objects, and determine that angles are congruent and sides are proportional.

This video tutorial demonstrates how to calculate the scale factor for two similar figures. [4:11]

Similar Triangles are explored in this video lesson. Students can check their understanding with an assessment. [5:51]

Compare angle measures and side length to determine if triangles are similar. Assess learning with a quiz.

Indirect measurement using shadows and proportions is explored in this video lesson. The tutorial includes a very detailed example of the concept.

This video tutorial [5:22] explores how objects are represented in a scale drawing to show they are similar. Assess learning with a quiz.

This video lesson [3:02] demonstrates how the scale factor and area of similar figures are related.

A relationship between scale factor and area can be determined using similar figures. Assess learning with a quiz.

This video lesson [3:38] demonstrates how to use scale factor to calculate the volume of similar figures. Students can check their understanding with an assessment.

Explore the relationship between scale factor and volume of similar solids. Assess learning with a quiz.

Similar figures are investigated in this video lesson. [4:30] It provides detailed examples using proportional relationships. Students can check their understanding with an assessment.

Multiply the perimeter of a smaller polygon by the scale factor to determine if polygons are similar in this video tutorial. [2:16] Assess learning with a quiz.

This video tutorial demonstrates how to determine if two solids are similar. The lesson includes detailed examples of the skill.