View Compilation Error

0_0_39082928_6257.cpp: In function 'int main()':
0_0_39082928_6257.cpp:26:14: error: 'angle' was not declared in this scope
   26 |          d = angle(360 * i / 12.0, 360 * j / 12.0, 360 * k / 12.0);
      |              ^~~~~