#include
using namespace std;
const float PI=3.1415926;
class circle{
public:
circle (float r);
float circumference ();
float area();
private:
float radius;
};
circle::circle(float r){
radius=r;
}
float circle::circumference(){
return 2*PI*radius;
}
float circle::area(){
return PI*radius*radius;
}
int main() {
float radius;
cout <<"enter the radius :"<
circle c(radius);
cout <
}
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