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Circumference of a circle: 2 x Pi x r (with r = the radius of the circle).

Area of a circle: Pi x r x r

The circumference is 28, so:

2 x Pi x r = 28

r = 28 / (2 x Pi)

Area = Pi x (28 / (2 x Pi)) x (28 / (2 x Pi)) = 62.4[rounded on one decimal] or more accurately (196 / Pi).

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Q: What is the surface area of a circle with a circumference of 28?
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