Pour cette figure, on a choisi  a = 4.

A = (4, 0, 0)
B = (0, 4, 0)
C = (0, 0, 4)
O = (0, 0, -0.00233763569535661)
OAB, b, o, a = Polygon(O, A, B)
I = Midpoint(A, B)
d = Segment(C, I)
c, OAC, ABC, BCO, arêteCO, arêteAC, arêteBC = Pyramid(OAB, C)
e = OrthogonalLine(O, ABC)
H = Intersect(e, ABC)
f = Segment(O, H)
g = Segment(O, I)
α = Angle(C, H, O, xOyPlane)