Start with

Multiply both sides by 5:

The answer is c=50.272, for other problems like this use the formula: The circumference = π x the diameter of the circle (Pi multiplied by the diameter of the circle).
You can check that the limit comes in an undefined form:

In these cases, we can use de l'Hospital rule, and evaluate the limit of the ratio of the derivatives. We have:

and

So, we have

Yes firebox beans Amanda’s