Explains how to determine the area of a pentagonal shaded region in a triangle. The triangle that is broken into multiple similar and congruent triangles. [10:07]

Explains how to identify and use similar triangles in order to determine unknown side lengths in two given diagrams. Each diagram also applies knowledge of angles formed when parallel lines are cut by a transversal. [7:37]

Explains how to determine unknown side lengths in a diagram that involves similar triangles where the two triangles share a side and the shared side corresponds to two different sides in each triangle. [6:05]

Demonstrates solutions to problems #17-20 of California Geometry released state test questions. Problems address understanding of similar triangles, parallelograms and properties of the diagonals of parallelograms. [11:11]

Explains the minimum amount of information needed to determine if two triangles are similar. Names and illustrates the similarity postulates: AA, SSS, and SAS. [12:14]

Demonstrates how to determine if triangles are similar based on AA, SSS, or SAS similarity postulates. Five different pairs of triangles are compared. [9:23]

Explains the difference between congruent triangles and similar triangles. Introduces the idea of scale factors. [9:17]

This lesson defines the phrase scale factor. It is 5 of 5 in the series titled "Scale Factors."

This lesson explains why similar triangles can be used to make indirect measurements, and provides an example. It is 1 of 5 in the series titled "Using Similar Triangles to Make Indirect Measurements."

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

Explains how to determine the area of a pentagonal shaded region in a triangle. The triangle that is broken into multiple similar and congruent triangles.

Explains how to determine unknown side lengths in a diagram that involves similar triangles where the two triangles share a side and the shared side corresponds to two different sides in each triangle.

A video showing an aplication using related rates.

Proof of the formula relating the area of a triangle to its circumradius.

This video lesson defines and provides an example of indirect measurement.

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.

Explore similar triangles and how to solve for unknown angles in this video tutorial. Check understanding with a quiz. [3:45[

Solve for unknown sides of similar triangles and take a quiz to assess learning.

This video lesson demonstrates how similar triangles can be used to make indirect measurements. Students can check their understanding with an assessment.

Learn how to solve for unknown sides of similar triangles and assess learning with a quiz.

Explains what it means for two triangles to be similar. Diagram of similar triangles is created with two parallel lines cut by two transversals.

Explains how to identify and use similar triangles in order to determine unknown side lengths in two given diagrams.

Students watch a video about similar and congruent triangles.