30-60-90 triangles

30-60-90 triangles are right triangles whose acute angles are 3030^\circ and 6060^\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 4545^\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.

Check your understanding

Problem 1
AB=AB=
Want to practice more problems like this? Check out this exercise.
Loading