# Circle Calculation

### Objective

To get more practice with using functions.

### Task

Your task is to write a program that will read in the radius of a circle, and print out the
diameter, circumference and area.

Your program should use a separate function for doing each calculation, and should
use parameters and return values to pass information back and forth.

The formulas are given below:

$diameter = 2 \times radius$

$area = \pi \times radius^2$

$circumference = 2 \times \pi \times radius$

### Details

- Write the functions to do each calculation.
- Test that each one works.
- Write main to ask the user to enter the radius, then call each function, and print the results.
- $\pi$ is available in Java as
`Math.PI`

### Submitting

When your program works, email the code to ifinlay@umw.edu.
Copyright © 2018 Ian Finlayson | Licensed under a Creative Commons Attribution 4.0 International License.