A trapezoid is a four-sided figure with only two parallel sides. Note that the height must be measured perpendicular to the parallel sides, Figure 13.14.
The area of a trapezoid is determined by the equation:
where A = Area; h = Height (distance between the parallel sides); a = Length of one parallel side; b = Length of the second parallel side.
Problem: What is the area (ac) of a trapezoid with parallel sides of 300.0 ft and 450.0 ft, and with a height of 120.0 ft?
Solution: (using conversion to acres):
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