A = (5, 2)
B = (-1, 4)
C = (1, -1)
triangolo, c, a, b = Polygon(A, B, C)
d = OrthogonalLine(A, a)
e = OrthogonalLine(B, b)
f = OrthogonalLine(C, c)
α = Angle(a, d)
β = Angle(c, f)
γ = Angle(b, e)
H = Intersect(d, e)
T1: "ortocentro: H(" + (x(H)) + ";" + (y(H)) + ")"