188.49=1/3*pi*r^2*5

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Solution for 188.49=1/3*pi*r^2*5 equation: 


r in (-oo:+oo)

188.49 = 5*(1/3)*pi*r^2 // - 5*(1/3)*pi*r^2

188.49-(5*(1/3)*pi*r^2) = 0

(-5/3)*pi*r^2+188.49 = 0

-5/3*pi*r^2 = -188.49 // : -5/3*pi

r^2 = 113.09399977*pi^-1

r^2 = 113.09399977*pi^-1 // ^ 1/2

abs(r) = 113.09399977^(1/2)*pi^(-1/2)

r = 113.09399977^(1/2)*pi^(-1/2) or r = -(113.09399977^(1/2)*pi^(-1/2))

r in { 113.09399977^(1/2)*pi^(-1/2), -(113.09399977^(1/2)*pi^(-1/2)) }

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