Q. 23

# If <span lang="EN

Answer :

Since, Let & Angle between is and angle between is  By vector addition method;

we have: =2(1+cos θ) =2(1-cos θ)

So,  Now in the parallelogram:

Area of parallelogram= (product of two sides and the sine of angle between them)

i.e. (1)

Also area of parallelogram= sum of area of all four triangle

And area of each triangle = So, Area = 2 Since are supplementary

A= 4 = (2)

From (1) &(2) we get:   Rate this question :

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