#include <stdio.h>
#define PI 3.14159265358979323846 // πの定義
 
// 円錐の体積を計算する関数
double delta_cone(double r, double h) {
    return (1.0 / 3.0) * PI * r * r * h; // 体積の計算
}
 
int main() {
    double radius, height;
 
    // 半径と高さの入力
    printf("2: ");
    scanf("%lf", &radius);
    printf("3: ");
    scanf("%lf", &height);
 
    // 体積の計算
    double volume = delta_cone(radius, height);
 
    // 結果の表示
    printf("円錐の体積: %.2f\n", volume);
	return 0;
}
 

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