In this video we'll learn how to use the midsegment of a triangle to establish a relationship between the smaller, interior triangle, and the larger, exterior triangle. When a line segment has its endpoints on opposite sides of the triangle, and it's parallel to the base of the triangle, we can set up a proportion between the side lengths.

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

MidSegments of Triangles: Geometry-Parallels and Polygons --(8:52).