Khan Academy: Similarity Example Where Same Side Plays Different Roles

Supplement your scholars' knowledge of angles involved with parallel lines. Using the properties of alternate interior angles and linear pairs, the presenter shows interior angles located on the same side of a transversal of parallel...

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

Given two polygons, try to map one onto the other using angle-preserving transformations, and determine whether they are similar. Transformations are done in "intuitive mode." Students receive immediate feedback and have the opportunity...

This video lesson demonstrates how to determine whether given polygons are similar by trying to map one onto the other. The instructor uses angle-preserving transformations in this process.

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

Students watch a video about similar and congruent triangles.

An older video where Sal finds the images of shapes under various rotations, and where he determines the rotations that take one shape to another.

Worked example of linear regression using transformed data. Adapted from 2007 AP Statistics free response, form b, question 6, part d.

Worked example identifying observational study.