Question

Show that the area of the parallelogram whose diagonals are given by →a and →b is ∣→a×→b∣2.Also find the area of the parallelogram whose diagonals are 2ˆi+ˆj+ˆk and ˆi+3ˆj+ˆk.

Answer 1

Final Answer :
$\frac{1}{2} \times \sqrt{30} sq. \: units$


For Calculation see pic.