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if in a triangle ABC,(I is incentre) given that IA=5i+3j, IB=-j, IC=3i + j then a) angle C=∏/2 b) tan 2A=24/7 c) sin A + sin B + sin C=12/5 d)cos A + cos B + cos C=12/5

if in a triangle ABC,(I is incentre) given that IA=5i+3j, IB=-j, IC=3i + j then


a) angle C=∏/2


b) tan 2A=24/7


c) sin A + sin B + sin C=12/5


d)cos A + cos B + cos C=12/5

Grade:12

1 Answers

SAGAR SINGH - IIT DELHI
878 Points
13 years ago

Dear student,

The correct answer is c)

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Sagar Singh

B.Tech, IIT Delhi

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