include
using namespace std;
class polygon
{
protected:
int width;
int height;
public: void setvalues(int a, int b) { width = a; height = b; } }; class rectangle :public polygon { int area() { return widthheight; } }; class triangle :public polygon { int area() { return widthheight / 2; } }; int main() { rectangle rect; triangle tri; rect.setvalues(5, 6); tri.setvalues(4, 8); cout << "rectangle area=" << rect.area << endl; cout << "triangle area=" << tri.area << endl; system("pause"); return 0;
}