(b) ...

(c) ...

S_{CG}

A = (2, 2)
B = Point(Circle[A, 15])
f = Segment(A, B)
B' = Rotate(B, 45°, A)
α = Angle(B, A, B')
g = Ray(A, B')
c = Circle(A, 4)
D = Intersect(c, g, 1)
u = Vector(A, D)
C = Translate(B, u)
h = OrthogonalLine(A, f)
d = Circle(A, 9)
E = Intersect(d, h, 2)
H = Translate(E, u)
i = OrthogonalLine(B, f)
j = Line(E, f)
F = Intersect(i, j)
G = Translate(F, u)
k = Segment(E, A)
l = Segment(A, B)
m = Segment(B, F)
n = Segment(F, E)
p = Segment(E, H)
q = Segment(H, G)
r = Segment(G, F)
s = Segment(G, C)
t = Segment(C, B)
a = Segment(H, D)
b = Segment(D, A)
e = Segment(D, C)
I = Midpoint(C, G)
J = Midpoint(m)
P = Midpoint(F, J)