What is a polygon?
An n-gon is a polygon with n sides; for example, a triangle is a 3-gon. A polygon is a 2-dimensional example of the more general polytope in any number of dimensions.
This we must commit to memory so we can define and recognise a polygon when we see one and then worship it in accordance with our religious principles, or we will one day find ourselves worshiping circles or other irregular shapes, which is the antithesis of polygons because they will have no sides at all.
Now the West is worshiping evil instead of good, because so many Westerners saw nothing wrong in playing fast and loose with their religious principles.
I will give you another another more practical example.
A paid to have his rising damp fixed by B.
When the work was done, B told A not to have the walls painted for at least 6 weeks.
C, a decorator, asked the B if it was OK to paint A's walls after 2 weeks. B, having forgotten his own rule, said yes.
A was approached by C to paint his walls. A agreed, having forgotten B's prohibition.
Will A's damp problem recur because his walls were painted too early? Whose fault was it? What was the guiding principle that should have been remembered and A and B which was not told to C? How much is it going to cost A to have the problem fixed if the damp problem recurs? And all because the principle of not painting the walls for at least 6 weeks was not remembered or passed on.