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

 

https://latex.artofproblemsolving.com/5/e/9/5e95ff0f346c35f3a6cc9ae53d6ce2dc585bb21e.png

 Jun 15, 2018
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Pick one of the following solutions:

 

https://web2.0calc.com/questions/geometry_16414

https://web2.0calc.com/questions/let-the-incircle-of-triangle-abc-be-tangent-to-sides

https://web2.0calc.com/questions/sorry-cphill-here-is-the-full-geometry-question

 Jun 15, 2018

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