Angle Bisector Theorem
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Let ABC be a triangle. Let AD bisect BAC. Then BD×AC = AB×DC.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"Angle Bisector Theorem"
http://demonstrations.wolfram.com/AngleBisectorTheorem/
Wolfram Demonstrations Project
Published: March 7 2011