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In a triangle ABC, let /C=pi//2. If r is...

In a triangle ABC, let `/_C=pi//2`. If r is the inradius and R is the circum-radius of the triangle, then `2(r+R)` is equal to :

A

`a+b`

B

`b+c`

C

`c+a`

D

`a+b+c`

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A
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