Circle Area
import java.util.Scanner;
import java.util.InputMismatchException;
 
public class circle_area    
{
    public static void main(String [] args) {
        //double pi;
        Scanner sc = new Scanner(System.in);
        System.out.println("insert radius");
        double radius = sc.nextDouble();
        //double pi = 3.14159;
        System.out.println("circle area = " + Math.PI * radius * radius);
    }
}

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