85=1/3*3.14*r^2*9

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Solution for 85=1/3*3.14*r^2*9 equation: 


r in (-oo:+oo)

85 = 3.14*9*(1/3)*r^2 // - 3.14*9*(1/3)*r^2

85-(3.14*9*(1/3)*r^2) = 0

85-9.42*r^2 = 0

-9.42*r^2 = -85 // : -9.42

r^2 = 9.02335456

r^2 = 9.02335456 // ^ 1/2

abs(r) = 9.02335456^(1/2)

r = 9.02335456^(1/2) or r = -9.02335456^(1/2)

r in { 9.02335456^(1/2), -9.02335456^(1/2) }

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