3.20=1/3r2pi

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Solution for 3.20=1/3r2pi equation: 


r in (-oo:+oo)

3.2 = (1/3)*pi*r^2 // - (1/3)*pi*r^2

3.2-((1/3)*pi*r^2) = 0

(-1/3)*pi*r^2+3.2 = 0

-1/3*pi*r^2 = -3.2 // : -1/3*pi

r^2 = 9.6000001*pi^-1

r^2 = 9.6000001*pi^-1 // ^ 1/2

abs(r) = 9.6000001^(1/2)*pi^(-1/2)

r = 9.6000001^(1/2)*pi^(-1/2) or r = -(9.6000001^(1/2)*pi^(-1/2))

r in { 9.6000001^(1/2)*pi^(-1/2), -(9.6000001^(1/2)*pi^(-1/2)) }

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