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A trapezoid has two parallel sides, and two that are not. Call the distance between the two parallel sides the height (H). Add the length of the two parallel sides (L1 + L2), multiple this by the height (H) and then divide by 2. This can be experessed as - ((L1 + L2) * H ) / 2 Remember, L1 and L2 are the length of the parallel sides, and H is the distance between the parallel sides. We do not care about the length or angle of the other sides.

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