Geometry Problem 197: Area of a Triangle, Side, Inradius, and Exradius,
Typography, iPad Apps
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In the figure below, given a triangle
ABC of area S, r is the inradius, and ra is
the exradius relative to side BC = a. Prove that:
\(S = \dfrac{a \cdot r \cdot r_a}{r_a-r}\).
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Sketch and Typography of problem 197 using iPad Apps
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