Wot?

public class Campus {

    public static void main(String[] args) {
        double radio = 7.5;
        double area = Math.PI * Math.pow(radio, 2);
        double perimetro = 2 * radio * Math.PI;
        System.out.println("Perimetor es: " + perimetro);
        System.out.println("Area es: " + area);
    }
}