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(i) Circumference = pi x Diameter

(ii) Area = pi x Radius^2

From (i),

D = C/pi

R= (C/pi)/2

Substituting into (ii),

Area = pi x ((C/pi)/2)^2

Simplifying:

A = (C^2) / (4 x pi)

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Q: What is the formula for an area of a circumference?
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