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Please help,I need a few tips, I am not getting anywhere with it.
Let the incircle of triangle ABC be tangent to sides
, , and at , , and , respectively. Prove that triangle DEF is acute.[Edited latex by admin]
Let ABCD be a cyclic quadrilateral. Let P be the intersection of $\overline{AD}$ and $\overline{BC}$, and let Q be the intersection of $\overline{AB}$ and $\overline{CD}$. Prove that the angle bisectors of $\angle DPC$ and $\angle AQD$ are perpendicular.
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