1.

Find the area of triangle if position vector of vertices w.r.t. O is -hat(i)+2hat(j)+3hat(k),2hat(i)-hat(j)-hat(k),hat(i)+hat(j)-hat(k).

Answer»

`(SQRT(89))/(2)sq.units`
`(89)/(2)sq.units`
`(2)/(sqrt(79))sq.units`
`(79)/(2)sq.units`

ANSWER :A


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