Polygon Portals

I generealized the tools from the Polygon Portal sketch [br]([url]http://www.geogebratube.org/material/show/id/131862[/url])[br]to give the user more control, working for your choice of vertices, center and turning point.[br]Though this only has tools for triangles and quadrilaterals and the original did regular n-gons.[br][br]Hope it's fun for you and you can make something pretty!