An incredible theorem for a unique and effective equation to determine the universal constant Pi π definite and definitive After millennia of attempts to calculate the circle with all sorts of simulations, until recognizing an identity to π, and yet with results often different and disputable, all that was missing was to be able to ‘bring it out into the open’ to identify it with certainty and without any approximations. This task was accomplished by the "Pi-draw­er", a ge­o­met­ric de­vice de­signed to lit­er­al­ly ex­tract from the cir­cle and per­form the ex­act cal­cu­la­tion of the re­al Pi con­stant, by means of a 4th degree pol­y­no­mi­al e­qua­tion, with ra­tion­al co­ef­fi­cients and a single variable. The theorem was ultimately matured in four years from a first introductory publication "2x2=3.14" (2021) about the squaring of the circle, followed by several articles and evidences to point out the actual π against reiterated adaptations, but unable to demonstrate it. The alleged impossibility of achieving the Squaring of the Circle has thus been overturned in the same context.

The author will be proud to be able to dedicate to The International Day of Mathematics (IDM), the Pi day of March 14th, 2026, the revelation of the real integral π, Trying to simulate or cage a circumference using polygonal or straight arguments, rightly led up to now to an inevitably limited outcome – since ‘infinity’ is unattainable – on average lower by about 2.5»3.01‰, which from now on indicates the gap from any rectilinear formation to the true circle, that's to say from a chord to its symmetrical arc.This amazing solution was attained through an inverse geometric process, as it allowed to exactly extrapolate the natural π from the circle itself, converting it into a manageable rectilinear segment. In the appendix, the introduction to the «Cosmogony of the Golden Section», which is closely related to π, being fundamental for the semantic and epistemological trait. NB - Its release date is prior to the demonstration of the actual "Pi-drawer".