Since polygons can be circumscribed by a circle, on can base trigonometric curves based on polygonal shapes.[br][br]Thanks to Daniel Mentrard [url=http://dmentrard.free.fr/GEOGEBRA/Maths/export4.26/SinuspolygMD.html]http://dmentrard.free.fr/GEOGEBRA/Maths/export4.26/SinuspolygMD.html[/url]