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You said "diameter", so we'll assume that you're talking about a circle.

Circumference of a circle (distance around, 'perimeter') = (pi) x diameter = 6 pi = 18.85 cm (rounded)

Area of a circle = (pi) R2 = (pi) x (1/2 of the diameter)2 = 9 pi = 28.27 cm2 (rounded)

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13y ago

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