142=1/3*3.14*r^2*8.5

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Solution for 142=1/3*3.14*r^2*8.5 equation: 


r in (-oo:+oo)

142 = 3.14*8.5*(1/3)*r^2 // - 3.14*8.5*(1/3)*r^2

142-(3.14*8.5*(1/3)*r^2) = 0

142-8.89666667*r^2 = 0

-8.89666667*r^2 = -142 // : -8.89666667

r^2 = 15.96103409

r^2 = 15.96103409 // ^ 1/2

abs(r) = 15.96103409^(1/2)

r = 15.96103409^(1/2) or r = -15.96103409^(1/2)

r in { 15.96103409^(1/2), -15.96103409^(1/2) }

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