View Compilation Error

0_0_38012144_19595.cpp: In function 'double area(double, double, double)':
0_0_38012144_19595.cpp:11:16: error: 'eps' was not declared in this scope
     if(r1+r2<d+eps)
                ^
0_0_38012144_19595.cpp:13:22: error: 'eps' was not declared in this scope
     if(d<fabs(r1-r2)+eps)
                      ^