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

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


r in (-oo:+oo)

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

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

( 12-r )

12-r = 0 // - 12

-r = -12 // * -1

r = 12

( 3.14*r^2 )

3.14*r^2 = 0 // : 3.14

r^2 = 0

r = 0

r in { 12, 0 }

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