Find the surface area of a sphere with a diameter 12 cm. Round your answer to the nearest whole number.

The radius is half the 12 cm diameter, so r = 6 cm. The surface area of a sphere is 4πr², giving 4π(6²) = 144π ≈ 452.4 square centimeters. Rounded to the nearest whole number, the surface area is 452 sq. cm, choice b.

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