A manufacturing company is making pizza trays that have a radius of 9 inches. There is a protective lip surrounding the tray so the pizza does not slide off. What is the length of the protective lip?

The protective lip goes all the way around the circular tray, so its length is the circumference. Using C = 2πr with a radius of 9 inches gives C = 2 × 3.14 × 9 = 56.52 inches, so the correct choice is D, 56.52 inches.

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