1.

If veca=hati + 2 hatj + 2hatk, |vecb|=5 and angle between veca and vecb is (pi)/(60, then the area of the triangle formed by these two vectors as two side is :

Answer»

`(15 SQRT3)/(2)`
`(15)/(4)`
15
`(15)/(2)`

ANSWER :B


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