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There is no equivalence. A cm is a measure of length or distance while a square cm is a measure of area. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid without some addition information.
To find the area of a triangle, you use the formula: Area = 1/2 * base * height. Plugging in the values, we get Area = 1/2 * 18 m * 20 m = 180 square meters. Therefore, the area of the triangle is 180 square meters.