Java Program for calculating the Area of a circle
Area of a circle using Java :
Here, in this page we will write the program to find area of circle using java. The area of a circle is the number of square units inside the circle. If we know the radius of the circle, then we can directly calculate the area by using a standard formula,
A = π * (radius * radius)
Working:-
- Calculate the area by using the standard formula:
A = π * (radius * radius)
or
A = π * (diameter * diameter)/4
- Print the result.
Code in Java using Radius
Run
//Java program to calculate area of a circle
import java.util.Scanner;
public class Main
{
public static void main(String[] args)
{
double radius = 7;
//formula for area of a circle
double area = 3.14 * radius * radius;
System.out.println(area);
}
}
Output
153.86
Code in Java using Diameter
Run
//Java program to calculate area of a circle
import java.util.Scanner;
public class Main
{
public static void main(String[] args)
{
double d = 14;
//formula for area of a circle
double area = (3.14 * d * d)/4;
System.out.println(area);
}
}
Output
153.86
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public class CircleArea {
public static void main(String[] args) {
int r=2;
double res=Math.PI*r*r;
System.out.println(res);
}
}