#include "figure.h"
#include <cmath>

Figure::Figure(double r0): r(r0) {}

double Figure::volume() {

return 4.0/3.0*M_PI*pow(r, 3);
}

double Figure::square_area() {
return 4*M_PI*pow(r, 2);
}

void Figure::change_size(double x){
this -> r = r*x;
}