A: (1, 1, 1)
B: (3, 1, 1)
C: (2, 1 + sqrt(3), 1)
D: (2, 1 + sqrt(3) / 3, 1 + sqrt(8 / 3))
a = Sphere(A, 1)
b = Sphere(B, 1)
c = Sphere(C, 1)
k1, c_1, a_1, b_1 = Polygon(A, B, C)
d = Sphere(D, 1)
e, tahkoABD, tahkoBCD, tahkoACD, särmäAD, särmäBD, särmäCD = Pyramid(k1, D)