100

AB = 2AC

A = (2.04, 5.76)
c = Circle(A, 10)
D = Point(c)
f = Segment(A, D)
D' = Rotate(D, (-(60°)), A)
α = Angle(D', A, D)
g = Line(A, D')
D'_1 = Rotate(D, 60°, A)
β = Angle(D, A, D'_1)
h = Line(A, D'_1)
d = Circle(A, 15)
B_1, C = Intersect(d, h)
e = Circle(A, 30)
E, B = Intersect(e, g)
i = Segment(B, C)
j = Segment(A, C)
k = Segment(A, B)