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

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


D( r )

2*r = 0

2*r = 0

2*r = 0

2*r = 0 // : 2

r = 0

r in (-oo:0) U (0:+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 = 0

r-1.57 = 0 // + 1.57

r = 1.57

r = 1.57

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