Answer to Question #253618 in Java | JSP | JSF for Sara

Question

6-Write a program to calculate the area of a circle. Use the formula Pi * r * r to work the program. Remember Pi is a constant and r is a variable entered by the user at runtime (once the program is running). Format the answer to 2 decimal places.

Answer 1

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Radius: ");
        double radius = in.nextDouble();
        System.out.printf("Area: %.2f", Math.PI * radius * radius);
    }
}