UVA Problem 438 – The Circumference of the Circle Solution

Problem Solving, UVa

 

 

#include<bits/stdc++.h>

#include<math.h>

#define pi 3.141592653589793



int main()

{

double x1,x2,y1,y2,x3,y3,a,b,c,s,radius,d,circle;



while(scanf("%lf %lf %lf %lf %lf %lf",&x1,&y1,&x2,&y2,&x3,&y3) != EOF)

{

a=sqrt(pow((x1-x2),2)+pow((y1-y2),2));

b=sqrt(pow((x2-x3),2)+pow((y2-y3),2));

c=sqrt(pow((x3-x1),2)+pow((y3-y1),2));



s=(a+b+c)/2;



radius=a*b*c/(4*sqrt((s*(s-a)*(s-b)*(s-c))));



circle=2*pi*radius;



printf("%.2lf\n",circle);

}

return 0;

}

 

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