#include<stdio.h>
#include<math.h>
int main()
{
    float a, b, c;
    scanf("%f %f %f", &a, &b, &c);
    printf("circumference=%.2f area=%.2f", a + b + c,1.0/2* sqrt(b * b * c * c - 1.0 / 4 * ((b * b + c * c - a * a) * (b * b + c * c - a * a))));
    return 0;
}