View Compilation Error

0_0_33525976_28119.cpp: In function 'int main()':
0_0_33525976_28119.cpp:92:37: error: 'Angle' was not declared in this scope
             double an = Angle(v1, v2)/2;
                                     ^
0_0_33525976_28119.cpp:93:40: error: 'ang' was not declared in this scope
             double len = (double)r/sin(ang);
                                        ^
0_0_33525976_28119.cpp:95:40: error: 'Length' was not declared in this scope
             Point o = p[1]+v3/Length(v3)*len;
                                        ^