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In a triangle ABC , let angleC=(pi)/2. I...

In a triangle ABC , let `angleC=(pi)/2`. If r is the in-radius 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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ML KHANNA-PROPERTIES OF TRIANGLES -Problem Set (4)(MULTIPLE CHOICE QUESTIONS)
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  14. Show that, 4 R r cos ""A/2cos ""B/2 cos ""C/2 =S

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