188.49=1/2*3.14*r^2*5

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Solution for 188.49=1/2*3.14*r^2*5 equation: 


r in (-oo:+oo)

188.49 = 3.14*5*(1/2)*r^2 // - 3.14*5*(1/2)*r^2

188.49-(3.14*5*(1/2)*r^2) = 0

188.49-7.85*r^2 = 0

-7.85*r^2 = -188.49 // : -7.85

r^2 = 24.01146497

r^2 = 24.01146497 // ^ 1/2

abs(r) = 24.01146497^(1/2)

r = 24.01146497^(1/2) or r = -24.01146497^(1/2)

r in { 24.01146497^(1/2), -24.01146497^(1/2) }

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