94.2=(1/3)*3.14*r2*10

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Solution for 94.2=(1/3)*3.14*r2*10 equation: 


r in (-oo:+oo)

94.2 = 3.14*10*(1/3)*r^2 // - 3.14*10*(1/3)*r^2

94.2-(3.14*10*(1/3)*r^2) = 0

94.2-10.46666667*r^2 = 0

-10.46666667*r^2 = -94.2 // : -10.46666667

r^2 = 9

r^2 = 9 // ^ 1/2

abs(r) = 3

r = 3 or r = -3

r in { 3, -3 }

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