diameter AB

circle O

chord DE

secant FG

radius OC

tangent HI

central angle JOK

inscribed angle LMN

arc PQ

O = (0, 0)
R = (-5.285069999999999, -3.851259999999999)
c = Circle(O, R)
a = Line(R, O)
d = false
e = false
C = Point(c)
D = Point(c)
E = Point(c)
f = Segment(D, E)
g = false
F = Point(c)
G = Point(c)
h = Line(F, G)
i = false
j = Segment(O, C)
k = false
H = Point(c)
l = Tangent(H, c)
I = Point(l)
m = false
J = Point(c)
K = Point(c)
n = Segment(J, O)
p = Segment(O, K)
α = Angle(J, O, K)
o = false
L = Point(c)
M = Point(c)
N = Point(c)
q = Segment(L, M)
r = Segment(M, N)
β = Angle(L, M, N)
s = false
P = Point(c)
Q = Point(c)
t = CircleArc(O, P, Q)
u = false
A = Point(c)
a_1 = Line(A, O)
B = Intersect(c, a_1, 2.0)
b_1 = Segment(A, B)