Déplacer les points rouges

A = (2, -2)
B = (-4, -2)
B' = Mirror(B, A)
C = (3.0186970235112858, 2.866486256567408)
C' = Mirror(C, A)
q1, b, c, b', c' = Polygon(B, C, B', C')
f = Segment(C, C')
g = Segment(B, B')