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In a triangle ABC , if 2R + r = r(1) , t...

In a `triangle ABC` , if 2R + r =` r_(1)` , then

A

`angleA=pi//2`

B

`angleB=pi//2`

C

`angleC=pi//2`

D

none of these

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To solve the problem step-by-step, we start with the given equation and use the properties of triangles and circles related to them. ### Step-by-Step Solution: 1. **Given Equation**: We start with the equation given in the problem: \[ 2R + r = r_1 ...
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