The area of the trapezoid can be calculated using the formula A = 1/2 * (b1 + b2) * h, where b1 and b2 are the lengths of the top and bottom of the trapezoid, and h is the height of the trapezoid.
In this case, b1 = 10 yards, b2 = 20 yards, and h = 6.4 yards.
Plugging in these values, we get:
A = 1/2 * (10 + 20) * 6.4
A = 1/2 * 30 * 6.4
A = 15 * 6.4
A = 96 square yards
Therefore, 96 square yards of rubber will be needed for this park.