There is no equivalence.
A foot is a measure of length or distance in 1-dimensional space while 40 m x 18 m appears to be a measure of area in 2-dimensional space. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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25m x 6m x 18m = 2,700 cubic m
40m² = 430.556 ft2
The GCF is m.
216 square meters.
The formula for the area of a triangle is, A = 1/2b x h, where b is base and h is height. A = 1/2(18m) x 20m = 180m2 Another way to write the formula for the area of a triangle is A = (b x h)/2, which gives the same answer. A = (18m x 20m)/2 = 180m2