m∠POA

P'

S'

c: x^(2) + y^(2) = 1
P = Point(c)
O = Intersect(xAxis, yAxis)
A = Point(c)
f = Segment(P, O)
α = Angle(A, O, P)
d: x^(2) + y^(2) = 2.5
g = Line(O, P)
B = Intersect(d, g, 2)
h = Segment(P, B)
S: (α, sin(α))
T: (α, (sqrt(2.5) * sin(α)))
C: (cos(α), 0)
D: ((sqrt(2.5) * cos(α)), 0)
i = Segment(P, C)
j = Segment(B, D)
k: x = 4
l = OrthogonalLine(B, k)
m = OrthogonalLine(P, k)
E = Intersect(k, m)
u = Vector(P, E)
F = Intersect(k, l)
v = Vector(B, F)
n: x = -11
p = OrthogonalLine(T, n)
q = OrthogonalLine(S, n)
G = Intersect(n, p)
w = Vector(G, T)
H = Intersect(n, q)
a = Vector(H, S)