13.16.17  Checking if circles are in a bundle: is_harmonic_circle_bundle

The is_harmonic_circle_bundle command determines how circles are related.

• is_harmonic_circle_bundle takes one argument:
  L, a list or sequence of circles.
• is_harmonic_circle_bundle(L) returns:
  • 1 if the circles pass through a common point.
  • 2 if the circles are concentric.
  • 3 if the circles are the same.
  • 0 otherwise.

Example.
Input:

Output: