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If ABCD is a quadrillateral such that vec(AB) = vec(i) + 2vec(j), vec(AD)= vec(j) + 2vec(k) and vec(AC)= 2 (vec(i) + 2vec(j)) + 3(vec(j) + 2vec(k)), then area of the quadrilateral ABCD is |
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Answer» `(5 sqrt21)/(2)` |
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