View Compilation Error

0_0_33164209_23082.cpp: In function 'double isangle(std::pair<int, int>, std::pair<int, int>, std::pair<int, int>)':
0_0_33164209_23082.cpp:86:15: error: 'di' was not declared in this scope
     double lb=di
               ^
0_0_33164209_23082.cpp:86:15: error: expected ',' or ';' at end of input
0_0_33164209_23082.cpp:86:15: error: expected '}' at end of input