Using 3.14 as Pi the area of circle is: 0
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Circumference = 2 x pie x radius Therefore, radius = 10/2/pie =1.6
divide the circumference by pie (3.14) and the answer would be the radius. for example circumference = 314 pie = 3.14 so 314 divide by 3.14 = 100 so the radius = 100
A = 25 pi so R = 5, making C = 10 pi ie 31.415 m
circumference = diamiter times pie 3.14 times 10 move the decimal over once its 31.4
If a circle's diameter is 10, the circumference is: 31.416