Thursday, October 23, 2008

Elearn Geometry Problem 196: Inradius and Exradii Formula

Triangle: inradius, exradii formula

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.
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1 comment:

  1. AnonymousOctober 24, 2008 at 5:41 AM

    referring to Elearn Geometry Problem 195,
    S(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

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