Góc X = 

Đo góc X

A = (12.994119705703637, 2.0468291416937423)
B = (12.994119705703637, -2.6010854598451916)
a = Segment(A, B)
b = OrthogonalLine(A, a)
c = Circle(A, B)
C = Intersect(c, b, 2.0)
d = Circle(C, B)
D = Intersect(d, b, 2.0)
e = Segment(A, C)
f = Segment(C, D)
g = Segment(D, B)
h = Segment(C, B)
α = Angle(B, A, C)
X = Angle(C, D, B)
text2: X + ""
i = false