$α$

angle droit 1

a2

angle droit 2

reset

mesure

r = 12 (slider from 1 to 30, step 1)
D = (-13.624303096640967, 39.229067397425126)
E = Point(Circle[D, r])
i = Segment(D, E)
j = OrthogonalLine(D, i)
c = Circle(D, E)
n = Line(D, E)
C = Intersect(c, n, 2)
g = OrthogonalLine(C, n)
F = Intersect(c, j, 1)
h = OrthogonalLine(F, j)
G = Intersect(g, h)
k = Ray(D, E)
m = Ray(D, D + (1, 0))
l = Segment(D, F)
A: D + (0, ((-r) * 1.15))
d = Circle(A, r / 11)
e = Circle(A, r / 20)
B = Point(m)
α = Angle(F, D, B)
a1 = false
β = Angle(F, D, E)
γ = Angle(B, D, E)
a = false
a3 = false
δ = Angle(A, D, F)
o = false
p = false
ε = Angle(A, D, B)
f = Segment(D, D + (0, ((-r) * 1.1)))
H = Intersect(c, m)
I = (54.74336108428001, 24.319812536752828)
J = Point(Ray[I, I + (1, 0)])
texte1: "" + (LaTeX[γ]) + ""
b = false
q = Segment(I, J)