Problem 81. Triangle Area, Side, Inradius, Circumradius.
Level: High School, College, SAT Prep.

Given a triangle ABC, the incircle of center I, inradius r, and circumradius R. If BC = a, prove that area of
triangle DIE  . Post a comment.
 
 

 

HINTS:

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See: Proposed Problem 80.

 

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AREA OF A TRIANGLE:

Sides and circumradius Formula