Answers

2015-02-06T16:07:35+05:30
Bg=be, cg=cf, af=ae (tangents from same point)
ed=dg=r
bgde is an square.

cg=cf=a-r
ae=af=c-r
b=a-r + c-r
b+2r=a+c
2r=a+c-b
r=a+c-b/2
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