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#1 Re: Help Me ! » Proof » 2014-07-09 01:55:56

Please help,I need a few tips, I am not getting anywhere with it.

#2 Help Me ! » Proof » 2014-07-08 03:43:16

rptamin
Replies: 2

Let the incircle of triangle ABC be tangent to sides

,
, and
at
,
, and
, respectively. Prove that triangle DEF is acute.

[Edited latex by admin]

#3 Help Me ! » geometry problem » 2014-07-02 02:33:44

rptamin
Replies: 1

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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