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12 December, 23:04

The area of a circle is 31.4 cm. Using the approximation for pi of 3.14, what is the diameter of the circle?

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  1. 12 December, 23:08
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    31,4=3,14x2xr

    r=31,4/6,28

    r=5

    R=2xr

    R:2x5=10
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