Construcció d'un decàgon regular

( n -2 ) * 180º /  n  =  8*180º / 10 =  144º  angle central

360º / 10 = 36º  angle central

O = (0.4, 1.8333333333333333)
A = (3, 6)
c = Circle(O, A)
B = Point(c)
a = Segment(A, B)
C = Rotate(A, 36°, O)
α = Angle(A, O, C)
D = Rotate(C, 36°, O)
β = Angle(C, O, D)
E = Rotate(D, 36°, O)
γ = Angle(D, O, E)
F = Rotate(E, 36°, O)
δ = Angle(E, O, F)
G = Point(c)
b = Segment(C, G)
H = Point(c)
d = Segment(D, H)
I = Point(c)
e = Segment(E, I)
J = Point(c)
f = Segment(F, J)
g = Segment(A, J)
h = Segment(J, I)
i = Segment(I, H)
j = Segment(H, G)
k = Segment(G, B)
l = Segment(B, F)
m = Segment(F, E)
n = Segment(E, D)
p = Segment(D, C)
q = Segment(C, A)