Handball : Angles inscrits, angle au centre
Author: Yvan Monka - m@ths et tiques

rayon = 7.1000000000000005 (slider from 0 to 15, step 0.1)
O = (8.6, 3.6)
a = 7
c = Circle(O, rayon)
J = Point(c)
A = Point(c)
B = Point(c)
b = Segment(A, O)
d = Segment(O, B)
e = Segment(B, J)
f = Segment(J, A)
J1 = (0.23333333333333334, 8.266666666666666)
g = Segment(A, J1)
h = Segment(J1, B)
α = Angle(A, O, B)
β = Angle(A, J1, B)
γ = Angle(A, J, B)
i = Segment(A, B)
F = Midpoint(A, B)
k = Circle(F, B)
j = OrthogonalLine(F, i)
G = Intersect(k, j, 2)
l = Line(G, i)
m = OrthogonalLine(B, i)
n = OrthogonalLine(A, i)
Z2_1 = Intersect(l, m)
Z1_1 = Intersect(l, n)
C = Intersect(k, j, 1)
p = Line(C, l)
Z1 = Intersect(n, p)
Z2 = Intersect(m, p)