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Triangle Angle Bisector Theorem - YourTeacher.com - Math Help
By yourteachermathhelp
Skip ahead to :18 to see another sample problem worked through. This time we're using the angle bisector theorem. Don't be confused by the word "ray" here -- she means the "bisector" or "line segment." Remember: bisect = cut in half.
Angle bisector theorem proof | Special properties and parts of triangles | Geometry | Khan Academy
By Khan Academy
In this video, we'll quickly review the angle bisector theorem, and then we'll see how it's proven. We prove it by extending a parallel line to one of the triangle's legs. That tells us information about the interior angles!
8.5 Three Theorems Involving Proportions (Lesson)
By AutenMath
A lesson on the Angle Bisector and Side Splitter theorems and a theorem relating segments cut by two transversals and three or more parallel lines.
Geometry: 5-1 Perpendicular and Angle Bisectors
By Sir Tyler Tarver
If these helped at all, PRETTY PLEASE Like my Facebook Page: http://facebook.com/tylersokay http://www.tylertarver.com How to prove and apply theorems about perpendicular bisectors. Prove and apply theorems about angle bisectors. Pick the world up and drop in on your head?