Consider a circle whose size can vary. Let r represent the radius of the circle (in cm) and let C represent the circumference of the circle (in cm). Suppose the function f determines the circumference of the circle in cm, C , given its radius length in cm, r . Required:
a. Write a function formula for f.
b. What does f(12) represent in this context?
c. If f(a)=12, what does a represent in this context?
e. What values can f(r) assume in this context?