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Question

In any ΔABC, sinA+sinB+sinC=

A
2sR
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B
sR
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C
3sR
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D
none of these
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Solution

The correct option is B sR
sinA+sinB+sinC=a2R+b2R+c2R ...[ from sine rule]
=a+b+c2R=2s2R=sR

Ans: B

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