Geometry Problem 197: Area of a Triangle, Side, Inradius, and Exradius,
Typography, iPad Apps

In the figure below, given a triangle
ABC of area S, r is the inradius, and r_{a} is
the exradius relative to side BC = a. Prove that:
\(S = \dfrac{a \cdot r \cdot r_a}{r_ar}\).
View or post a solution

Sketch and Typography of problem 197 using iPad Apps

