View Code of Problem 24

#include<stdio.h>
#include<math.h>
void main(){
	int a,b,c;
	double h,cosA,s;
	scanf("%d%d%d",&a,&b,&c);
	cosA=(b*b+c*c-a*a)/(2.0*b*c);
	h=sqrt(b*b-b*cosA*b*cosA);
	s=0.5*c*h;
	printf("%.2f\n",s);
}