Question 1190322
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The area of ANY triangle is the product of its semi-perimeter by the radius of the inscribed circle.


                        {{{area[ABC]}}} = r * s.



                    MEMORIZE  it  ( ! )



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For the proof,  see the lesson


&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Surface-area/Proof-of-the-formula-for-the-area-of-a-triangle-via-the-radius-of-the-inscribed-circle.lesson>Proof of the formula for the area of a triangle via the radius of the inscribed circle</A>  


in this site.