Let the incircle of triangle $ABC$ be tangent to sides $\overline{BC}$, $\overline{AC}$, and $\overline{AB}$ at $D$, $E$, and $F$, respectively. Prove that triangle $DEF$ is acute.

I have tried proving that triangle DEF's angles were les than the opposite angles in triangle ABC, but that wasn't really complete. Can anyone help?

4 answers

What do all the dollar signs ($) signify?
They're just a format you can ignore them
Please do not post the questions we give you for homework to other websites.
haha nice try maight