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The circumference is [ pi * 2r ] so the radius r = C/2pi

r = 31.42/(2*pi) = 5.000648312 cm

The area is [ pi * r2 ]

A = pi* (5.000648312)2 = 78.56018498 or about 78.56 square cm

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Q: If the circumference of a circle is 31.42cm find its area?
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