r=(2*3.14*r/2)/2*r

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Solution for r=(2*3.14*r/2)/2*r equation: 


r in (-oo:+oo)

r = (((2*3.14*r)/2)/2)*r // - (((2*3.14*r)/2)/2)*r

r-((((2*3.14*r)/2)/2)*r) = 0

r-1.57*r^2 = 0

r-1.57*r^2 = 0

DELTA = 1^2-(-1.57*0*4)

DELTA = 1

DELTA > 0

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

r = 0 or r = 0.63694268

r in { 0, 0.63694268 }

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