Question

show that a parallelogram is rectangle​

Answer 1

Answer:

If the diagonals of a parallelogram are congruent, then it's a rectangle (neither the reverse of the definition nor the converse of a property). If a parallelogram contains a right angle, then it's a rectangle (neither the reverse of the definition nor the converse of a property).

Answer 2

If parallelogram diagonals are congurent (means equal ) then it is a rectangle, or if its one angle is 90degree so it can be a rectangle.