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The area of a trapezoid can be calculated using the formula: A = 1/2 * (b1 + b2) * h, where b1 and b2 are the lengths of the two parallel sides and h is the height.
In this case, let's assume the two parallel sides (b1 and b2) are 80 yards and 60 yards respectively, and the height (h) is 50 yards.
Plugging these values into the formula, we get: A = 1/2 * (80 + 60) * 50 = 1/2 * 140 * 50 = 7000 square yards.
Therefore, 7000 square yards of rubber will be needed for this park.