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Folded Paper (Posted on 2008-04-29) Difficulty: 3 of 5
A square sheet of paper ABCD is folded with D falling on BC at D', with A falling on A', and A'D' intersecting AB at E.

Prove that the inradius of triangle EBD' is equal to |A'E|.

See The Solution Submitted by Bractals    
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