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The formula for the area of a triangle is 1/2bh, so one-half of the base times the height. With a base of 18 inches, one half of the base would be 9 inches. This, multiplied by the height of 20m converted to inches (787.4 inches) gives the problem 9 x 787.4 = 7086.6 in2, or 49.212 ft2

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