A = (1, 1)
B = (5, 4)
u = Vector(A, B)
C = (7.4824546426980625, 0.4139324025640048)
v = Vector(A, C)
D = Translate(B, v)
w = Vector(B, D)
C' = Translate(C, u)
z = Vector(C, C')
areal, a, b, b', c = Polygon(A, B, D, C)
NumeriskVærdiAfDeterminant: abs(x(u) * y(v) - x(v) * y(u))