There are some really powerful ways of showing that two triangles are congruent. Watch as professor and mathematician Edward Burger proves two triangles are congruent by using side-angle-side (SAS) congruence. This video is from Thinkwell's award-winning Geometry course. See www.thinkwellhomeschool.com for more videos like this one along with exercises, worksheets, quizzes, notes, and more!