12=2(3.1415)r

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Solution for 12=2(3.1415)r equation: 



12=2(3.1415)r

We move all terms to the left:

12-(2(3.1415)r)=0



We calculate terms in parentheses: -(2(3.1415)r), so:

2(3.1415)r

We multiply parentheses

6.283r

Back to the equation:

-(6.283r)



We add all the numbers together, and all the variables

-(+6.283r)+12=0

We get rid of parentheses

-6.283r+12=0

We move all terms containing r to the left, all other terms to the right

-6.283r=-12

r=-12/-6.283

r=1+3.32964472918/3.65928945836

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