Parallelogram

What is the geometric interpretation of the identity (vec(a)-vec(b))xx(vec(a)+vec(b))=2(vec(a)xxvec(b)) ? 1. If the diagonals of a given parallelogram are used as sides of a second parallelogram, then the area of the second parallelogram is twice that of the given parallelogram. 2. If the semi-diagonals of a given parallelogram are used as sides of a second parallelogram, then the area of the second parallelogram is half that of the given parallelogram. Select the correct answer using the code given below