37.68=4*3.14*r

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Solution for 37.68=4*3.14*r equation: 


Simplifying
37.68 = 4 * 3.14r

Multiply 4 * 3.14
37.68 = 12.56r

Solving
37.68 = 12.56r

Solving for variable 'r'.

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

Add '-12.56r' to each side of the equation.
37.68 + -12.56r = 12.56r + -12.56r

Combine like terms: 12.56r + -12.56r = 0.00
37.68 + -12.56r = 0.00

Add '-37.68' to each side of the equation.
37.68 + -37.68 + -12.56r = 0.00 + -37.68

Combine like terms: 37.68 + -37.68 = 0.00
0.00 + -12.56r = 0.00 + -37.68
-12.56r = 0.00 + -37.68

Combine like terms: 0.00 + -37.68 = -37.68
-12.56r = -37.68

Divide each side by '-12.56'.
r = 3

Simplifying
r = 3

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