# Circle Calculation

### Objective

To get more practice with using functions.

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.