381.51=4/3*3.14*r^3

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Solution for 381.51=4/3*3.14*r^3 equation: 


r in (-oo:+oo)

381.51 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3

381.51-(3.14*(4/3)*r^3) = 0

381.51-4.18666667*r^3 = 0

-4.18666667*r^3 = -381.51 // : -4.18666667

r^3 = 91.12499993

r^3 = 91.12499993 // ^ 1/3

r = 91.12499993^(1/3)

r = 91.12499993^(1/3)

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