A: (1, 0, 3)
B: (2, 2, 1)
C: (-2, 1, 1)
D: (0, 4, 5)
E: (32 / 39, 28 / 39, 83 / 39)
k1, c, a, b = Polygon(A, B, C)
d, tahkoABD_{1}, tahkoBCD_{1}, tahkoACD_{1}, särmäAD_{1}, särmäBD_{1}, särmäCD_{1} = Pyramid(k1, D)
f = OrthogonalLine(D, k1)