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pie x D = Pie x 9 = 28.3 ( to 1 dp) The circumfrence is roughly 3 times the diameter
r2*pie=circumference 9(9)*pie 81*pie 254
(pie)(diameter)=(circumference) (pie)(9)(2)=18(pie)=56.549
for the surface area:4 times pie times radius squared for volume:4/3 times pie times radius cubed
9. Circumference equals 2 times Pi times the radius. C=2(pi)r. "r" for radius. So if your circumference is 18 times pi, then you do 18 divided by 2, which gives you a radius of 9.