(EF) ⃗=(EA) ⃗+(AD) ⃗+(DF) ⃗
(EF) ⃗=(EB) ⃗+(BC) ⃗+(CF) ⃗
2(EF) ⃗=(BC) ⃗+(AD) ⃗
(EF) ⃗=((BC) ⃗+(AD) ⃗)/2
EF=(BC+AD)/2

A = Intersect(xAxis, yAxis)
B = (2, 3)
C = (4.48, 3)
D = Point(xAxis)
многоугольник1, a, b, c, d = Polygon(A, B, C, D)
E = Point(a)
F = Point(c)
e = Segment(E, F)
u = Vector(E, A)
v = Vector(A, D)
w = Vector(D, F)
z = Vector(E, B)
f = Vector(B, C)
g = Vector(C, F)