In this video we'll learn about the special things that happen in the specific instance of a 45-45-90 triangle, which is a triangle whose three interior angles are 45 degrees, 45 degrees, and 90 degrees. This triangle, by definition, is an isosceles triangle, and it's one half of a square, split on the square's diagonal.

Streaming video file encoded with permission for digital streaming by Infobase on April 25, 2015.

45-45-90 Triangles: Geometry-Triangles --(10:53).