The angle bisector theorem states that the angle bisector of an angle in a triangle divides the opposite side in the same ratio as the sides adjacent to the angle.
Angle Bisector Theorem
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Weisstein, Eric W. "Angle Bisector Theorem." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/AngleBisectorTheorem.html