Which statement can be used to prove that a given parallelogram is a rectangle? The diagonals of the parallelograms are congruent.
The diagonals of the parallelogram are perpendicular.
All the sides of the parallelogram are equal in measure.
The angles of the parallelogram are congruent.
The bottom one, "The angles of the parallelogram are congruent" this means that either the shape is a rectangle, or a square (which is a special type of rectangle).
