SOLUTION: If s is the semi-perimeter of triangle ABC and r is the radius of its incircle, what is the area of triangle ABC in terms of r and s?

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Question 1190322: If s is the semi-perimeter of triangle ABC and r is the radius of its incircle, what is the area of triangle ABC in terms of r and s?
Answer by ikleyn(52814) About Me  (Show Source):
You can put this solution on YOUR website!
.

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

                    area%5BABC%5D = r * s.


                    MEMORIZE  it  ( ! )


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For the proof,  see the lesson

    - Proof of the formula for the area of a triangle via the radius of the inscribed circle

in this site.