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Add vectors vecA,vecB and vecC which hav...

Add vectors `vecA,vecB` and `vecC` which have equal magnitude s of 50 unit and are inclined at angles of `45^(@), 135^(@)` and `315^(@)` respectively from x-axos.

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`:' |vec(A)+vec(B)|=|vec(A)-vec(B)| :. sqrt(A^(2)+B^(2)+2AB cos theta)=sqrt(A^(2)+B^(2)-2AB cos theta)`
or `A^(2)+B^(2)+2AB cos theta=A^(2)+B^(2)-2AB cos theta` or `cos theta=0 :. theta=90^(@)`
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