A trampoline manufacturer is creating a bumper for the outside edge of a circular trampoline with a diameter of 10 feet. What is the total length of the bumper?

The bumper goes around the trampoline’s circular edge, so its length is the circumference. Use C = πd with diameter 10 feet: C ≈ 3.14 × 10 = 31.4 feet. Therefore, the total bumper length is 31.4 feet, choice D.

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