What is an example of parallelogram with both base and height the sides?

A square is an example of a parallelogram where both the base and height are the same as the lengths of its sides. In a square, each side acts as a base, and the height, which is the perpendicular distance from the base to the opposite side, is equal to the length of the side as well. Thus, in a square, both the base and height are the same.