Question

calculate the area of circle.

				
					Area of circle=π*radius of circle*radius of circle
π=3.1415926535897.... taking pi upto 2 decimal places
radius of circle=10cm
then,
area of circle==3.14*10*10=314sq cm


Enter the radius of circle
12
Area of circle=452.15999999999997

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Code

				
					import java.util.Scanner;
public class areaOfCircle
{  
    public static void main(String args[])  
    {  
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter the radius of circle");
        double r=sc.nextDouble();
        //pi=3.1415926535897.... taking pi upto 2 decimal places
        double pi=3.14;
        /*Formula of area of circle =pi*r*r */
        double area=pi*r*r;  
        System.out.println("Area of circle="+area);  
     }  
}