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Angle Bisector Theorem | Proof Examples - Study. com The angle bisector theorem states that if you have a triangle, and you find the angle bisector of one of the angles of the triangle, the bisector will divide the side across from the angle into
Proving the length of angle bisector - Mathematics Stack Exchange 11 How do I prove that a triangle with sides a, b, c, has an angle bisector (bisecting angle A) is of length: $$\frac {2 \sqrt {bcs (s-a)}} {b+c}$$ I have tried using the sine and cosine rule but have largely failed A few times I have found a way but they are way too messy to work with