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If f is the centre of a circle inscribed...

If `f` is the centre of a circle inscribed in a triangle `ABC`, then `|vec(BC)|vec(IA)+|vec(CA)|vec(IB)+|vec(AB)|vec(IC)` is

A

zero

B

`(vecIA +vecIB + vecIC)/(3)`

C

`3(vecIA + vecIB + vecIC)`

D

none of these

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The correct Answer is:
A
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DISHA PUBLICATION-VECTOR ALGEBRA-EXERCISE -1 : CONCEPT BUILDER
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  16. Let veca , vecb , vecc be three unit vectors such that |veca + vecb +...

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  18. The two vectors (x^2 - 1)hati +(x+2)hatj + x^2 hatk and 2hati -xhatj +...

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