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A B C D is quadrilateral such that vec ...

`A B C D` is quadrilateral such that ` vec A B= vec b , vec A D= vec d , vec A C=m vec b+p vec ddot` Show that he area of the quadrilateral `A B C Di s1/2|m+p|| vec bxx vec d|dot`

A

`1/2(m+p)abs(b times d)`

B

`(m+p)abs(b times d)`

C

`2(m+p)abs(b times d)`

D

`1/2abs(m-p)abs(b times d)`

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