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Cible atteinte! Bravo.

14 cm

c

b

a

a+b+c=180°

La somme des mesures
des angles d'un triangle
vaut toujours 180°

Aide?

r1 = 10 (slider from 1 to 16, step 1)
A = (5.05, 4.98)
B = Point(Circle[A, r1])
B' = Rotate(B, 35°, A)
g = Ray(A, B')
h = OrthogonalLine(B, g)
C = Intersect(h, g)
c = Circle(C, 14)
C' = Rotate(C, 140°, B)
i = Ray(B, C')
f = Segment(A, B)
C_{1} = Midpoint(f)
Cible = Intersect(c, i)
Cible2: Cible
texte3: "" + r1 + " cm"
α = Angle(B, A, B')
β = Angle(A, C, B)
γ = Angle(C, B, C')
l = Segment(B, C)
m = Segment(C, A)
j = Segment(C, Cible)
k = Segment(B, Cible)
n = Segment(Cible, A)
D = (-11.87, 2.48)
E = (-12.77, 0.58)
p = Segment(D, E)
F = (-8.85, 0.5)
q = Segment(E, F)
r = Segment(D, F)
δ = Angle(D, F, E)
ε = Angle(E, D, F)
ζ = Angle(F, E, D)
a = false