Centre d'un cercle circonscrit
Author: Patrice Debart

A = (2, 1)
B = (7, 3)
C = (8, -3)
d_1 = LineBisector(A, B)
d_2 = LineBisector(B, C)
O = Intersect(d_1, d_2)
c = Circle(A, B, C)

Tool: Centre cercle (command Centre_cercle)
A partir de trois points du cercle
Input: A, B, C
Output: O

d1 = LineBisector(A, B)
d2 = LineBisector(B, C)
O = Intersect(d1, d2)