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If vecA+ vecB = vecC and A+B=C, then th...

If `vecA+ vecB = vecC and A+B=C`, then the angle between `vecA and vecB` is :

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Verified by Experts

The correct Answer is:
`sqrt(5)`

Area of triangle
`=1/2 |vec(A)xxvec(B)|=1/2 (4hat(k)+2hat(j))`
`vec(A)=(hat(j)+2hat(k))`
`|A|=sqrt(5) m^(2)`
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