Area of Trapezium by using a parallelogram

Author:
Lew W.S.
In the trapezium shown, the sides with length of a units and b units are parallel. The perpendicular distance between them is h units Use the "ship's steering wheel" and the "translate" slider to make a second trapezium such that a larger parallelogram is formed! Answer the questions below the diagrams.

1. What is the area of the parallelogram formed from the 2 identical trapeziums ? (In terms of a, b and h)

2. What would be the area of one trapezium? (In terms of a, b and h)