Wikipedia:Articles for deletion/Rational trigonometry
This is clearly a fringe theory (this is acknowledged in the body of the article). This is almost , as nobody has claimed that the theory has been useful for him or that it solves pre-existing problems. The content of the theory  consists only in replacing the distance by its square (which is not new as quoted above) and the angles by the square of their sinus (which prevents to consider oriented and obtuse angles). Thus this theory is very similar to tau (2pi) proponent (consisting in replacing, for similar biased reasons, pi by 2pi), but it is much less notable
— User:D, 17:20, 25 November 2013 (UTC)
Stance: delete
Cited policy: WP:original research (Wikipedia:No original research)