# 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:
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:
$AB=$