Constant E and PI

Type	Field	Summary
static double	E	base of the natural logarithms.
static double	PI	pi.


public class Main {
  public static void main(String[] args) throws Exception {
    System.out.println(Math.E);
    System.out.println(Math.PI);
  }

}

The output:


2.718281828459045
3.141592653589793

Calculate Circle Area using it's radius

 


public class Main {
  public static void main(String[] args) {
    int radius = 5;

    double area = Math.PI * radius * radius;

    System.out.println("Area of a circle is " + area);
  }
}

The output:


Area of a circle is 78.53981633974483

Calculate Circle Perimeter with radius

 
public class Main {
  public static void main(String[] args) {
    int radius = 5;

    double perimeter = 2 * Math.PI * radius;
    System.out.println("Perimeter: " + perimeter);
  }
}


Perimeter: 31.41592653589793

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