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11.16.3  Check if four points are concyclic: is_concyclic

The is_concyclic command is a Boolean function which takes as argument a list or sequence of points.

is_concyclic returns 1 if the points are cyclic and returns 0 otherwise.
Input:

is_concyclic(1+i, -1+i, -1-i, 1-i)

Output:

1

Input:

is_concyclic(i, -1+i, -1-i, 1-i)

Output:

0

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