Area of parallelogram = Base X Height
Base can be the length of any of the four sides.
Height is the perpendicular distance (the distance that forms a right angle with the chosen base) from the base to the opposite side.
Area of trapezoid = (b1+b2)H / 2; length of base 1 plus length of base 2 multiplied by the height and then divided by 2.
The bases of the trapezoid are the parallel sides. The height is the perpendicular distance between the bases.
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