#include <stdio.h>
 
int main(void) {
	#include <stdio.h>
 
// 台形の面積を計算する関数
double daikei(double a, double b, double d) {
    return (a + b) * d / 2.0;
}
 
int main(void) {
    double uwa = 5.0;  // 上底
    double shita = 10.0; // 下底
    double takasa = 4.0; // 高さ
    double result;
 
    result = daikei(uwa, shita, takasa);
 
    printf("上底%.1f、下底%.1f、高さ%.1fの台形の面積は %.1f です。\n", 
            uwa, shita, takasa, result);
 
    return 0;
}
	return 0;
}
 

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