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v = 4/3 pi r3 ie 4/3r3 = v/pi, take pi as 355/113 4/3r3 = 11 X 113/355 = very close to 3.5 so r3 = 3.5 x 3/4 = 10.5/4 =2.625 r = cube root of 2.625 = approx 1.38

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15y ago

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