1=2*3.14*r

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Solution for 1=2*3.14*r equation:


1=2*3.14*r

We simplify the equation to the form, which is simple to understand 
1=2*3.14*r

We move all terms containing r to the left and all other terms to the right. 
-6.28r=-1

We simplify left and right side of the equation. 
-6.28r=-1

We divide both sides of the equation by -06.28 to get r. 
r=0.15923566878981

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