Revision 88dfcf3c-ca26-4185-8913-2afbaaa75462

[Here](http://www.maa.org/sites/default/files/269122948517.pdf) you can find Grace Lin's proof without Words that The Product of the Perimeter of a Triangle and Its Inradius Is Twice the Area of the Triangle (see the figure below) 
 
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![Grace Lin's proof][1]

The proof originally appeared in the 1999 October issue of Mathematics Magazine.


  [1]: https://i.sstatic.net/9TuqK.jpg