In the triangle ABC AC = BC = 20 inches and AB = 10 inches. Circle is inscribed in the triangle, what is the radius of the circle...see attached...#71
2. Grey triangle:
3. The right triangle at the top of the grey triangle:
4. Calculate h from 2. and plug in this term into the equation in 3. Solve for r.
Second attempt: The 2 right triangles are similar. So use proportions:
First calculate h, then r using the proportion.