triangolo rettangolo

A = (4.137844689773493, -9.963009796864666)
B = (28, -10)
C = (-2, 2)
poli1, c, a, b = Polygon(A, B, C)
α = Angle(B, A, C)
β = Angle(A, C, B)
γ = Angle(C, B, A)