k = 1.6000000000000005 (slider from -5 to 5, step 0.1)
f(x) = k / x
A = Point(f)
B = Point(f)
C = Point(f)
poly1, c, a, b = Polygon(A, B, C)
d = OrthogonalLine(A, a)
e = OrthogonalLine(B, b)
D = Intersect(d, e)
α = Angle(b, e)
β = Angle(a, d)
E: (x(D), k / x(D))