What value of x makes the given parallelogram a square?

If the diagonals of a parallelogram are equal and intersect at right angles, then the parallelogram is a square.

If the diagonals of a parallelogram are equal and intersect at right angles,then the parallelogram is a square.

Find the values of x and y in the following parallelogram.

What value of x will make AOB a straight

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

Prove that sum of squares of the diagonals of a parallelogram is equal to sum of squares of its sides.

Prove that the sum of the squares of the diagonals of parallelogram is equal to sum of the squares of its sides.

Prove that the sum of the squares of the diagonals of parallelogram is equal to the sum of the squares of its sides.

Prove that the sum of the squares of the diagonals of parallelogram is equal to the sum of the squares of its sides.