Pi is apparently too short a title

A poem based on a numerical relationship. (Purely Platonic).

Having some relevance.
Perhaps
That is purposefully concealed
Partially
Permitting dear reader a discovery
That cleverly relates the whole to the central concept
Symbolised mathematically
Generally useful to know you know
To a certain degree accurately


Note:

The word count is what is significant for this poem, also, there is only one period, and it's placement is significant.