y_M

a

O = (0, 0)
I = (1, 0)
J = (0, 1)
c = Circle(O, 1)
M = Point(c)
a = Arc(c, I, M)
U: (0, y(M))
d = Segment(U, M)
P: (a, y(M))
A: (a, 0)
b = Segment(O, A)
e = Segment(P, A)
f = Segment(U, O)
g = Segment(U, P)