Versleep de punten A of B

A = (1, 1)
B = (5, 4)
C: (x(B), y(A))
v, c, a, b = Polygon(A, B, C)
α = Angle(B, C, A)
tekst2: "d(A,B)=\sqrt{ (" + (x(B)) + "-" + (x(A)) + ")^2 + (" + (y(B)) + "-" + (y(A)) + ")^2 }= " + (Length[Vector[A, B]])