The Japanese 5 yen coin has a hole in the middle. The diameter of the coin is 22 mm and the diameter of the hole is 5 mm. What is the difference between the outer edge and the inner edge of the coin? If necessary, round your answer to the nearest tenth.

The difference between the outer and inner edge lengths is the difference between their circumferences. Using circumference = π × diameter, the difference is π × (22 − 5) = 17π ≈ 53.4 mm. So the difference is 53.4 mm, choice B.

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