Given radius, find area & circumference of circle in java (example)

Leave a Comment / By Yogesh / August 20, 2016

Given a radius of circle, find the area and circumference of a circle.

Area of circle:

Area of circle = PI * radius * radius.
- e.g if radius is 5, then area of circle is
  - Area = 3.14 * 5 * 5
  - Area = 78.54

Circumference of circle

Circumference of circle is 2 * PI * radius
- e.g if radius is 5, then circumference of circle is
  - Circumference = 2 * 3.14 * 5
  - Circumference = 31.42

area circumference circle — Fig 1: Area & Circumference of circle

Program : find area & circumference of circle in java

package org.learn;
 
import java.util.Scanner;
 
public class AreaAndCircuferenceOfCircle {
 
    public static void main(String[] args) {
         
        try (Scanner scanner = new Scanner(System.in)) {
             
            System.out.printf("1. Enter radius of circle : ");
            double radius = scanner.nextDouble();
 
            // Area of circle is PI * radius * radius
            double area = Math.PI * radius * radius;
 
            // Print area up to two precision
            System.out.printf("2. Area of circle is : %4.2f", area);
 
            // Circumference of circle is 2 * PI * radius
            double circumference = 2 * Math.PI * radius;
 
            // Print area up to two precision
            System.out.printf("\n3. Circumference of circle is : %4.2f", circumference);
        }
    }
}

Output: Area & circumference of circle in java

Enter radius of circle : 5
Area of circle is : 78.54
Circumference of circle is : 31.42
 
Enter radius of circle : 10
Area of circle is : 314.16
Circumference of circle is : 62.83