Which figure always can be divided by a diagnal line into two right triangles parallelogream rhombus square or trapezoid?

We could have also said that a rectangle is a parallelogram with four right angles, since  (2) The diagonals of a rhombus bisect pairs of opposite angles.  Definition: A square is a parallelogram with four congruent sides and four  The diagonal splits our parallelogram into two triangles.