Monday, August 11, 2008

Elearn Geometry Problem 160



See complete Problem 160
Triangle, Incircle, Incenter, Circumcircle, Circumcenter, Inradius. Level: High School, SAT Prep, College geometry

Post your solutions or ideas in the comments.

2 comments:

  1. d=R-(r-OI)=R-r+OI,e=R-r-OI.
    So, de=(R-r)²-OI²=(R²-2Rr-OI²)+r².
    But, OI²=R²-2Rr (Problem 155)
    ∴de=r²

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  2. http://ahmetelmas.wordpress.com/2010/05/15/geo-geo/

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