1.

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

Answer»

`(5 sqrt21)/(2)`
`(3 sqrt21)/(2)`
`(sqrt21)/(2)`
`(7)/(2)`

ANSWER :C


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