# Java Program to Calculate Area of Circle

By | July 1, 2019

Task: Java Program to Calculate Area of Circle

## What is the formula for calculating Area of Circle?

The required formula for calculating area of circle is:

area = π . r2

Where r is the radius of the circle and π  is a mathematical constant with fixed value 3.1415. Java program to input radius and find area of circle

We should declare a constant for pi in this Java program, it will enhance program readability and clarity. Here is a detailed explaination on How to Declare a Constant in Java Programs With Examples.

### The source code of the Java program to input radius and find area of circle

```/*
Write a Java Program to input radius of a
circle and display the area of circle. Use the formula:
area = π . r2  where r is radius and π is a
mathematical constant with constant value 3.1415
Use a named constant for π.
*/
package areaofcircle;
/**
* @author EasyCodeBook.com
*/
import java.util.Scanner;
public class AreaOfCircle {
public static void main(String[] args) {

final double PI = 3.1415;
Scanner input = new Scanner(System.in);
System.out.print("Area of Circle=" + area);
}

}
```

#### The output of Java Program to calculate area of circle

run:
Area of Circle=78.53750000000001BUILD SUCCESSFUL (total time: 21 seconds)

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