Well, we have a plan. Let's implement it. First, implement a method that calculates the circumference of a circle. To do this, you need to write the correct formula in the method and specify the arguments. But what about pi, which we know is 3.141592... and so on to infinity? We'll keep things simple: let pi = 3.14.

# Calculate the circumference of a circle

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doble ... doble .. system c