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Problem of the Day #213: Length of an Angle Bisector October 18, 2011

Posted by Saketh in : potd , trackback

Triangle $ABC$ has sides of length $39$, $48$, and $71$. The bisector of angle $A$ cuts $BC$ at point $D$. Find the length of $AD$ in terms of $cos(\frac{A}{2})$.

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