A: (1, 1, 0)
B: (5, 1, 0)
C: (1, 5, 0)
D: (5, 5, 0)
m1, a, b, d, c = Polygon(A, B, D, C)
e, E, tahkoABE, tahkoBDE, tahkoCDE, tahkoACE, särmäAE, särmäBE, särmäDE, särmäCE = Pyramid(m1, 3)
α = Angle(A, E, D)
f = Segment(A, D)
g = Segment(C, B)
F = Intersect(f, g)
h = Segment(E, F)
β = Angle(E, D, A)
G = Midpoint(D, B)
i = Segment(G, F)
j = Segment(G, E)
γ = Angle(E, G, F)
δ = Angle(G, F, E)