Author: Simo K. Kivelä

A = (1.08, 1.32)
B = (3.02, 1.36)
c = Circle(A, B)
C = Point(c)
a = Line(A, B)
b = Ray(A, C)
D = Point(c)
d = Circle(D, A)
F, E = Intersect(d, a)
s = Line(E, D)
f = Segment(A, D)
α = Angle(B, A, C)
β = Angle(A, E, D)
text1: "3*β = " + (3 * β)