#include <stdio.h>
#include <math.h>
struct Triangle{
	double a;
	double b;
	double c;
};
 
int main(void) {
	struct Triangle now={5,5,5};
 
	printf("三角形の3辺を入力してください\n");
	scanf("%lf",&now.a);
	scanf("%lf",&now.b);
	scanf("%lf",&now.c);
 
	double t,s;
	t=(now.a+now.b+now.c)/2.0;
	s=sqrt(t*(t-now.a)*(t-now.b)*(t-now.c));
 
	printf("a: %f\n",now.a);
	printf("b: %f\n",now.b);
	printf("c: %f\n",now.c);
	printf("三角形の面積：%lf",s);
	return 0;
}

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NQo1CjU=

5
5
5