View Compilation Error

0_0_22206258_32282.cpp: In function 'int main()':
0_0_22206258_32282.cpp:47:14: error: 'dis5' was not declared in this scope
              dis5=dis(N[0].x,N[0].y,N[3].x,N[3].y);
              ^
0_0_22206258_32282.cpp:49:58: error: 'dis6' was not declared in this scope
             if(dis1==dis2&&dis2==dis3&&dis3==dis4&&dis5==dis6)
                                                          ^