S, T, A, B, C bewegen

A_{1} = (-0.72, -1.38)
D = (6.48, -3.42)
S = (14.113333333333337, 3.78666666666666)
g = Line(D, S)
T = (4.58, 6.573333333333325)
h = Line(D, T)
A = (10.54, -3.72)
B = (15.22, 0.24)
C = (11.4, -0.88)
i = Segment(A, B)
j = Segment(B, C)
k = Segment(C, A)
C' = Mirror(C, g)
B' = Mirror(B, g)
A' = Mirror(A, g)
l = Segment(A', B')
m = Segment(B', C')
n = Segment(C', A')
A'' = Mirror(A', h)
C'' = Mirror(C', h)
B'' = Mirror(B', h)
p = Segment(C'', A'')
q = Segment(A'', B'')
r = Segment(B'', C'')
c = CircleArc(D, A, A'')
d = CircleArc(D, C, C'')
e = CircleArc(D, B, B'')
f = Segment(D, A)
s = Segment(D, A')
t = Segment(D, A'')
α = Angle(A, D, A'')