1/3*3.14r^2(12-r)

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Solution for 1/3*3.14r^2(12-r) equation: 


r in (-oo:+oo)

3.14*(1/3)*r^2*(12-r) = 0

1.0466666562*r^2*(12-r) = 0

( 1.0466666562*r^2 )

1.0466666562*r^2 = 0 // : 1.0466666562

r^2 = 0

r = 0

( 12-r )

12-r = 0 // - 12

-r = -12 // * -1

r = 12

r in { 0, 12 }

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