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If  and  then the area of the quadrilateral ABCD is

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Concept:

The area of the quadrilateral ABCD =   , where  are diagonals.

Calculations:

Let     and   are the diagonal of the quadrilateral ABCD.

The area of the quadrilateral ABCD =  ....(1) 

⇒

⇒

⇒

⇒

From equation (1), we have

The area of the quadrilateral ABCD = 

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