$\scalebox{3} {%n}$

$\scalebox{2} {%n}$

$a$

$a$

$\,?$
$\Rightarrow$

O = (11.58534691524121, 4.64945223909283)
B = (12.80003075148953, 2.3277147799346536)
c = Circle(O, B)
f = Ray(B, O)
C = Intersect(c, f, 2)
g = OrthogonalLine(O, f)
D = Intersect(c, g, 1)
E = Intersect(c, g, 2)
h = Segment(C, D)
i = Segment(D, B)
j = Segment(C, E)
k = Segment(E, B)
distanceAB = Distance(O, B)
TextAB: Name[O] + (Name[B]) + " = " + distanceAB
α = Angle(C, D, B)
β = Angle(B, E, C)
γ = Angle(E, C, D)
δ = Angle(D, B, E)
l = OrthogonalLine(O, yAxis)
O_1 = Point(l)
d = Circle(O_1, distanceAB)
F = Intersect(c, i, 1)
e = Circle(O, distanceAB / sqrt(2))
G, H = Intersect(e, j)
I = Intersect(e, h)
J, K = Intersect(e, i)
L = Intersect(e, k)
p = Circle(O_1, distanceAB / sqrt(2))