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in a triangle ABC , let angle C = (...

in a triangle `ABC ,` let ` angle C = (pi)/(2) ` if `r ` the in radius and R is the circumradius of the triangle ABC , then 2( r+R) equals

A

`a+b `

B

`b+c`

C

`c+a`

D

`a+b+c`

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A
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