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Circumference of a circle = pi D

Circumference of the big one = 12 pi

Circumference of the small one = 8 pi

Difference = (12 pi - 8 pi) = (12 - 8) pi = 4 pi = 12.5664 inches (rounded)

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Q: How much longer is the circumference of a 12 inches diameter pizza have than an 8 inches diameter pizza?
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