[挑戰]正三角形內切兩圓
ΔABC is equilateral with side length 4. D is a point on BC such that BD = 1. If r and s are the radii of the inscribed circles of ΔADB and ΔADC respectively, find rs.
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- Dec 08 Tue 2009 22:12
[挑戰]正三角形內切兩圓
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