###### Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

##### Thank you for watching the video.

To unlock all 5,300 videos, start your free trial.

# Similar Triangles - Concept

Alissa Fong
###### Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

Share

Two figures are called congruent if they are the same shape and the same size. Two figures are called similar if they are the same shape, but different sizes. More formally, two shapes are similar if they have congruent angles, and corresponding sides are proportional. That means that there is a scale factor number that you multiply each number in the first shape by to get the corresponding side length in the other shape. We often solve for missing side lengths using proportions.

Transcript Coming Soon!