In this video we'll learn how to use the triangle side-splitting theorem to find the lengths of the sides of a triangle. The theorem tells us that, when we place a line segment inside a triangle which has its endpoints on opposite sides of the triangle and which is parallel to the side it doesn't touch, then we can set up a proportion between the lengths of the sides of the smaller triangle and the lengths of the sides of the bigger triangle.

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

Triangle Side-Splitting Theorem: Geometry-Dilations and Scale Factors --(4:24).