# Show that area of the parallelogram whose diagonals are given by and is Also find the area of the parallelogram whose diagonals are We have, Let ABCD be a parallelogram.

In ABCD,  So, We need to show that, Where, and are diagonals of the parallelogram ABCD.

Now, by triangle law of addition, we get   …(i)

Similarly,   …(ii)

Adding equations (i) and (ii), we get    …(iii)

And,    …(iv)

Now, can be written as,    [ and ]  We know that,

Vector area of parallelogram ABCD is given by,

Area of parallelogram ABCD   Hence, shown.

Now, we need to find the area of parallelogram whose diagonals are and .

We have already derived the relationship between area of parallelogram and diagonals of parallelogram, which is Here, And, Area of parallelogram        Thus, area of required parallelogram is .

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