#include <iostream.h> class point void maino int x,y; public point(int a, int b) point p(20, 20); Rx=a;y=b) float areaoireturn 0; circle c(8, 8, 30); cout<<p area(<<endl class circle: public point int radius; cout<<carea(<<endl; public cout<<c point: area(<<endl; circle(int a, int b, int r): point(a, b) i radius=r; f float areao f return 3.1416 radius*radius;#include <iostream.h> class point { int x,y; public: point(int a ,int b) {x=a;y=b} float area(){return 0;} }; class circle:public point { int radius; public: circle(int a,int b,int r):point(a,b) { radius=r;} float area() { return 3.1416*radius*radius;} }; void main() { point p(20,20); circle c(8,8,30); cout<<p.area()<<endl; cout<<c.area()<<endl; cout<<c.point::area()<<endl; }