1)   Let  A, B, C, and D  be vertices of a parallelogram with length c units and height b units.

2)   Place the parallelogram with vertex A at the origin, along the positive x-axis,

       and along the y-axis. Label the vertices A, B, C, and D.

3)   The y-coordinate of B is 0 because the vertex is on the x-axis.

       Since the side length is c, the x-coordinate is c.

4)    Since the height of the parallelogram is b units, the y-coordinates of C and D is b.

5)    In a parallelogram one pair of opposite sides are congruent and parallel.

        So, place the x-coordinates of C and D as the lengths AB and CD are same.

        Let the x-coordinate C be and the x-coordinate of D be d. \ \

The parallelogram with length c units and height  b units is