3

package task3;
class Triangle {
    int x,y,z;
    public double area(){
        double s = (x+y+z)/2;
        return Math.pow((s*(s-x)*(s-y)*(s-z)),.5);
    }
    public double perimeter(){
        return (x+y+z)/2;
    }
}

public class Task3 {


    public static void main(String[] args) {
      Triangle t = new Triangle();
        t.x= 3;
        t.y = 4;
        t.z = 5;
        System.out.println(t.area());
        System.out.println(t.perimeter());
    }

}