12.5=2*3.14159265359*r

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Solution for 12.5=2*3.14159265359*r equation: 


Simplifying
12.5 = 2 * 3.14159265359r

Multiply 2 * 3.14159265359
12.5 = 6.283185307r

Solving
12.5 = 6.283185307r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-6.283185307r' to each side of the equation.
12.5 + -6.283185307r = 6.283185307r + -6.283185307r

Combine like terms: 6.283185307r + -6.283185307r = 0.000000000
12.5 + -6.283185307r = 0.000000000

Add '-12.5' to each side of the equation.
12.5 + -12.5 + -6.283185307r = 0.000000000 + -12.5

Combine like terms: 12.5 + -12.5 = 0.0
0.0 + -6.283185307r = 0.000000000 + -12.5
-6.283185307r = 0.000000000 + -12.5

Combine like terms: 0.000000000 + -12.5 = -12.5
-6.283185307r = -12.5

Divide each side by '-6.283185307'.
r = 1.989436789

Simplifying
r = 1.989436789

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