See complete Problem 196 at:

www.gogeometry.com/problem/p196_triangle_inradius_exradius_formula.htm

Triangle: inradius and exradii formula. Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

## Thursday, October 23, 2008

### Elearn Geometry Problem 196: Inradius and Exradii Formula

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referring to Elearn Geometry Problem 195,

ReplyDeleteS(1/r_a+1/r_b+1/r_c)=(s-a+s-b+s-c)=s=S(1/r)

1/r_a+1/r_b+1/r_c=1/r