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a rectangle. It wouldn't be a square because that has 1 pair of 4 equal side but a rectangle has 2 pairs of equal sides and 4 right angles.
One property of a rectangle is that all angles of the figure are right angles.
Firstly, if all the angles are not 90 degrees it isn't a rectangle - with 4 sides it is a quadrilateral. So there is no "if". Area of a rectangle = length of 1 side multiplied by the length of an adjacent (touching) side.
A parallelogram is a rectangle when all of its angles are right angles (90 degrees). In other words, if the opposite sides of a parallelogram are equal in length and all angles measure 90 degrees, it is a rectangle.
The difference is: 1) the rectangle has all right angles 2)a parallelogram has acute and obtuse angles but not a rectangle