a = 80 (slider from -5 to 80, step 0.1)
A = Intersect(xAxis, yAxis)
c = Circle(A, a)
B, C = Intersect(c, yAxis)
D, E = Intersect(c, xAxis)
d = CircleArc(A, E, B)
F = Point(d)
e = CircleSector(A, E, F)
f = CircleSector(A, F, B)
b = Segment(A, F)
g = Segment(B, A)
h = Segment(A, E)
k = CircleArc(A, E, B)
α = Angle(E, A, F)
β = Angle(F, A, B)
G = Midpoint(E, A)
H = Midpoint(A, B)
i = AngularBisector(E, A, F)
j = AngularBisector(F, A, H)
p = CircleArc(A, G, H)
I = Intersect(p, j)
J = Intersect(p, i)
T1: "" + α
T2: "" + β
γ = Angle(E, A, F)
δ = Angle(F, A, B)