1/3(3.14)r^2*13=218

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Solution for 1/3(3.14)r^2*13=218 equation: 


r in (-oo:+oo)

3.14*13*(1/3)*r^2 = 218 // - 218

3.14*13*(1/3)*r^2-218 = 0

13.6066665306*r^2 = 218 // : 13.6066665306

r^2 = 16.02155822

r^2 = 16.02155822 // ^ 1/2

abs(r) = 16.02155822^(1/2)

r = 16.02155822^(1/2) or r = -16.02155822^(1/2)

r in { 16.02155822^(1/2), -16.02155822^(1/2) }

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