Phép vị tự tâm G, tỉ lệ k = -1/2

Tìm phép vị tự ABC->A'B'C'

A = (16.89342754546945, 27.039684831189042)
B = (9.31209311813415, 17.87063638765787)
a = Segment(A, B)
C = (24.911383327258612, 17.75155783644318)
b = Segment(B, C)
c = Segment(C, A)
C' = Midpoint(a)
A' = Midpoint(b)
B' = Midpoint(c)
d = Segment(A, A')
e = Segment(B', B)
G = Intersect(d, e)
f = Segment(C', C)
g = false