Final answer:
To express the radius r as a function of the circumference C, you can use the equation r = C/2π.
Step-by-step explanation:
To express the radius r as a function of the circumference C, we can rearrange the formula for the circumference of a circle: C(r) = 2πr. Since we want to express r in terms of C, we need to isolate r on one side of the equation. Divide both sides of the equation by 2π to get:
r = C/2π
This equation allows us to find the radius r in terms of the circumference C.