20=(1/3)3.14r^2

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Solution for 20=(1/3)3.14r^2 equation: 


r in (-oo:+oo)

20 = (1/3)^3.14*r^2 // - (1/3)^3.14*r^2

20-((1/3)^3.14*r^2) = 0

-(1/3)^3.14*r^2 = -20 // : -(1/3)^3.14

r^2 = 20/((1/3)^3.14)

r^2 = 20/((1/3)^3.14) // ^ 1/2

abs(r) = (2*5^(1/2))/((1/3)^1.57)

r = (2*5^(1/2))/((1/3)^1.57) or r = -((2*5^(1/2))/((1/3)^1.57))

r in { (2*5^(1/2))/((1/3)^1.57), -((2*5^(1/2))/((1/3)^1.57)) }

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