\delta=

ψ

a = 6 (slider from -5 to 10, step 1)
O = (0, 0)
A: (a, 0)
c = Circle(O, a)
K = Point(c)
J = Point(c)
p = CircleArc(O, K, J)
Q = Point(p)
pa = Line(Q, xAxis)
b = 4 (slider from -5 to 5, step 0.01)
f = Circle(O, b)
l = Segment(O, Q)
t = Segment(O, A)
b_1 = Line(O, A)
h_1 = Line(Q, A)
A_2: (a, 0)
p_1 = Circle(O, b)
H = (0.37443526170799235, 7.118884297520653)
g = Line(Q, b_1)
h = Line(A, l)
C = Intersect(h, g)
i = OrthogonalLine(O, b_1)
B_1 = Point(i)
D_1, B = Intersect(f, h_1)
d = Circle(B, C)
F, P = Intersect(d, i)
v2, q, b_9, b_{10}, c_5 = Polygon(Q, B_1, B, C)
j = Segment(C, A)
k = AngularBisector(C, B, P)
D = Intersect(k, g)
v3, d_1, c_1, b_{11}, p_2 = Polygon(D, C, B, P)
m = Line(Q, xAxis)
e = Circle(A_2, a)
C_2, G = Intersect(e, m)
v1, o, a_2, c_2, q_1 = Polygon(O, A_2, C_2, Q)
E = Point(c_2)
I = Intersect(o, a_2)
n = Line(E, I)
L, B_2 = Intersect(p_1, n)
r = Circle(B_2, O)
C_3, P_2 = Intersect(r, yAxis)
s = AngularBisector(C_2, B_2, P_2)
D_2 = Intersect(m, s)
f_1 = Line(C_2, B_2)
d1, b_2, d_2, c_3 = Polygon(D_2, C_2, B_2)
d2, c_4, d_3, b_3 = Polygon(D_2, B_2, C_2)
N = Intersect(f_1, o)
R = Intersect(s, o)
d3, r_1, b_4, n_1 = Polygon(B_2, N, R)
d4, i_1, b_5, r_2 = Polygon(B_2, R, I)
d5, b_6, q_2, d_4 = Polygon(Q, D_2, B_2)
α = Angle(B_2, Q, D_2)
ε = Angle(C_2, B_2, D_2)
δ = Angle(B_2, D_2, C_2)
γ = Angle(D_2, C_2, B_2)
v4, d_5, m_1, b_7, c_6 = Polygon(D_2, P_2, B_2, C_2)
v5, q_3, c_7, b_8, c_8 = Polygon(Q, C_3, B_2, C_2)
ω = Angle(D_2, B_2, Q)
ψ = Angle(O, P_2, B_2)
η = Angle(B_2, O, P_2)
θ = Angle(O, B_2, N)