#include <stdio.h>
#define PI 3.141592653589793
double delta_cone(double r, double h) {
return (1.0/3.0) * PI * r * r * h;
}
int main() {
double r, h, volume;
volume = delta_cone(r, h);
printf("円錐の体積は: %.2f\n", volume
);
return 0;
}
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