abstract class Polygon{
abstract public double perimeter();
abstract public double area();
}
class Triangle extends Polygon{
double a,b,c;
public Triangle(double a,double b,double c){
this.a = a;
this.b = b;
this.c = c;
}
public double perimeter(){
return (a + b + c);
}
public double area(){
double s = (a+b+c) / 2.0;
return Math.sqrt(s*(s-a)*(s-b)*(s-c));
}
}
class Square extends Polygon{
double w,h;
public Square(double w,double h){
this.w = w;
this.h = h;
}
public double perimeter(){
return ((w + h) * 2);
}
public double area(){
return (w*h);
}
}
public class PolygonTest {
public static void main(String[] args) {
Polygon a1 = new Triangle(5,6,8);
Polygon a2 = new Square(4,2);
System.out.println("Triangle perimeter : " + a1.perimeter());
System.out.println("Triangle area : " + a1.area());
System.out.println("Square perimeter : " + a2.perimeter());
System.out.println("Square area : " + a2.area());
}
}
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