# Similarity

Contents

Learn what it means for two figures to be similar, and how to determine whether two figures are similar or not. Use this concept to prove geometric theorems and solve some problems with polygons.

In this tutorial, you will learn how we determine whether two figures are similar.

In this tutorial, we will use what we learned about similarity of polygons in the specific case of triangles. We will come up with specific conditions for triangles to be similar, and use them to determine whether two triangles are similar.

Learn how to find missing measures of triangles using the fact that they are similar to other triangles.

Learn about the angle bisector theorem, which makes a clever use of triangle similarity in order to find a special proportion that holds for angle bisectors of triangles.

You already saw how we can use similarity and congruence to find missing measures in triangles. Let's do the same now to solve more kinds of polygons, and more challenging problems!

Now that you are an expert with solving geometry problems using congruence and similarity, you are ready to solve some real-world problems!