In c++, You have four classes--Polygon, Rectangle, Triangle, and Square. The latter three are subclasses of Polygon. Look through and understand the provided code. Implement the appropriate functions and classes where the comments indicate.

Please make it easy to read.

#include #include

using namespace std;

class Polygon{ protected: vector sides; public: virtual ~Polygon() {} int perimeter() { //Implement this function } virtual double area() = 0; };

class Rectangle : public Polygon { public: Rectangle() { sides.push_back(0.0); sides.push_back(0.0); } Rectangle(double a, double b) { sides.push_back(a); sides.push_back(b); } virtual double area() { // Implement this function } virtual double perimeter() { // Implement this function } };

class Triangle : public Polygon { double base; double height; public: Triangle() { sides.push_back(0.0); sides.push_back(0.0); sides.push_back(0.0); } Triangle(double a, double b, double c) { sides.push_back(a); sides.push_back(b); sides.push_back(c); } // Assume that the base and height will be set correctly externally void setBase(double _base) { base = _base; } void setHeight(double _height) { height = _height; } virtual double area() { // Implement this function } };

class Square : public Polygon { //Implement this class };

// use main for testing int main(){ return 0; }