# Special right triangles review

## 30-60-90 triangles

30-60-90 triangles are right triangles whose acute angles are $30^\circ$ and $60^\circ$. The sides in such triangles have special proportions:

*Want to learn more about 30-60-90 triangles? Check out this video.*

## 45-45-90 triangles

45-45-90 triangles are right triangles whose acute angles are both $45^\circ$. This makes them isosceles triangles, and their sides have special proportions:

The special properties of both of these special right triangles are a result of the Pythagorean theorem.

*Want to learn more about 45-45-90 triangles? Check out this video.*