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You have to treat it like a trapezoid. So think of it like a square plus a triangle. For example, a 15 ft wide room with wall lengths of 15 feet and 17 feet would be treated like a square + triangle. Square total = 15*15 = 225 square feet, triangle total = (17-15)*15*(1/2)= 15 square feet. Add them together and it would be 240 square feet total.

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