include<stdio.h>

include<math.h>

int main()
{
float a,b,c;
scanf("%f %f %f",&a,&b,&c);
if(a+b>c&&b+c>a&&a+c>b)
{
float num=a+b+c;
float p=(a+b+c)/2;
float sm=sqrt(p(p-a)(p-b)*(p-c));
printf("circumference=%.2f area=%.2f",num,sm);
}
else
printf("无法构成三角形");
return 0;
}