View Compilation Error

0_0_38911774_311.cpp: In function 'int main()':
0_0_38911774_311.cpp:85:62: error: 'struct std::pair<double, double>' has no member named 'c'
   85 |                         if(fabs((p[b].x-p[a].x)*(p[c].y-p[b].c)-(p[c].x-p[b].x)*(p[b].y-p[a].y))<0.00001)
      |                                                              ^