A = (4, 5)
B = (1, 3)
C = (4, 1)
D = (7, 3, 0)
f = Segment(A, D)
g = Segment(A, B)
h = Segment(B, C)
i = Segment(C, D)
a = 0 (slider from -5 to 5)
b: x - a = 0
P = (-3, 1, 4)
l = Segment(P, B)
m = Segment(P, A)
n = Segment(P, D)
p = Segment(P, C)
C' = Intersect(p, b)
D' = Intersect(n, b)
B' = Intersect(l, b)
A' = Intersect(m, b)
q = Segment(B', A')
r = Segment(A', D')
s = Segment(D', C')
t = Segment(D', C')
c = Segment(C', B')
f_1 = Line(D', A')
g_1 = Line(C', B')
h_1 = Line(B', A')
i_1 = Line(C', D')
E = Intersect(f_1, g_1)
F = Intersect(h_1, i_1)
d: z = z(P)
j = Line(E, F)
v1, c_1, d_1, a_1, b_1 = Polygon(C, D, A, B)
v2, d', c', b', a' = Polygon(D', C', B', A')