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Let vec(OA)= vec(a), vec(OB)= 10vec(a) +...

Let `vec(OA)= vec(a), vec(OB)= 10vec(a) + 2vec(b), vec(OC )= vec(b)` where O, A, C are non-collinear points. Let `lamda` denote the area of the quadrilateral OABC and let `mu` denote the area of parallelogram with `vec(OA) and vec(OC)` as ajacent sides show that `lamda= 6mu`

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