import java.util.*;
 
class Ideone {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double r, a, p;
        System.out.println("Enter the radius:");
        r = sc.nextDouble();
        a = 0.5 * 3.14 * r * r; // Area of semicircle
        p = 3.14 * r + 2 * r;   // Perimeter of semicircle
        System.out.println("The area = " + a);
        System.out.println("Perimeter = " + p);
    }
}
 
 
 
 

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4