\frac{\pi}{6}

$ \frac{\pi}{4} $

$ \frac{\pi}{3} $

$ \frac{\pi}{2} $

$ \frac{2\pi}{3} $

$ \frac{3\pi}{4} $

$ \frac{5\pi}{6} $

$ \pi $

$ \frac{7\pi}{6} $

\frac{5\pi}{4}

\frac{4\pi}{3}

\frac{3\pi}{2}

\frac{5\pi}{3}

\frac{7\pi}{4}

\frac{11\pi}{6}

2\pi

A = Point(xAxis)
B = Intersect(xAxis, yAxis)
c = Circle(B, A)
A'_1 = Rotate(A, 45*°, B)
A''_1 = Rotate(A'_1, 45*°, B)
A'''_1 = Rotate(A''_1, 45*°, B)
C = Rotate(A'''_1, 45*°, B)
C' = Rotate(C, 45*°, B)
C'' = Rotate(C', 45*°, B)
C''' = Rotate(C'', 45*°, B)
A' = Rotate(A, 30*°, B)
A'' = Rotate(A', 30*°, B)
A''' = Rotate(A'', 30*°, B)
D = Rotate(A''', 30*°, B)
D' = Rotate(D, 30*°, B)
D'' = Rotate(D', 30*°, B)
D''' = Rotate(D'', 30*°, B)
E = Rotate(D''', 30*°, B)
E' = Rotate(E, 30*°, B)
E'' = Rotate(E', 30*°, B)
E''' = Rotate(E'', 30*°, B)
b = Line(B, A'_1)
d = Line(B, A'')
e = Line(B, D)
f = Line(B, A'''_1)
g = Line(B, D')
α = 0 rad (slider from 0 to 6.283185307179586, step 0.017453292519943295)
A'_2 = Rotate(A, α, B)
β = Angle(A, B, A'_2)
a = Segment(B, A'_2)