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In any triangle ABC, r1r2+r2r3+r3r1=...

In any triangle ABC, `r_1r_2+r_2r_3+r_3r_1=`

A

`(triangle^2)/(r^2)`

B

`(triangle)/(r )`

C

`(2triangle)/(r )`

D

`triangle^2`

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The correct Answer is:
A
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