#include<stdio.h>
#include<math.h>
int main(void)
{
float a,b,c;
scanf("%f %f %f ",&a,&b,&c);
float m=a+b+c;
float p=m/2;
float s=sqrt(p*(p-a)*(p-b)*(p-c));
printf("circumference=%.2f area=%.2f",m,s);
return 0;
} 
#include<stdio.h>
#include<math.h>
int main(void)
{
float a,b,c;
scanf("%f %f %f ",&a,&b,&c);
float m=a+b+c;
float p=m/2;
float s=sqrt(p*(p-a)*(p-b)*(p-c));
printf("circumference=%.2f area=%.2f",m,s);
return 0;
}