Lesson: Similarity of Triangles Mathematics • 8th Grade

In this lesson, we will learn how to determine and prove whether two triangles are similar using equality of corresponding angles or proportionality of corresponding sides and how to use similarity to find unknown lengths and angles.

Lesson Video

Sample Question Videos

05:02
03:09
02:55

Lesson Worksheet

Q1:

In the given figure, and are parallel. Using the AA criterion, what can we say about triangles and ?

Q2:

Given that and are parallel, are triangles and similar? If yes, why?

Q3:

The two triangles in the given figure have equal angles. Is this enough to prove that the two triangles are similar?