A torus is shaped like a doughnut. If its inner radius is a and its outer radius is b, its...

A torus is shaped like a doughnut. If its inner radius is a and its outer radius is b, its volume and surface area are given by

a. Create a user-defined function that computes V and A from the arguments a and b.

b. Suppose that the outer radius is constrained to be 2 in. greater than the inner radius. Write a script file that uses your function to plot A and V versus a for 0.25 ≤ a ≤ 4 in.