Write a formula for arc length S in terms of r for the following figure. 1.2 r S The angle in the figure is a central angle in radians.

Which of the following best describes the graph below? + + 2 + 3 + 4 1 o a. it is not a function. o b. it is a one-to-one function. o c. it is a many-to-one function. o d. it is a function, but it is not one-to-one.