Angle Bisectors and Finding the Measure of an Angle 

An angle bisector is a ray that divides an angle into 2 congruent angles. Watch as professor and mathematician Edward Burger shows how to find the measure of an angle using bisectors and relationships in algebra. 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!