Linda+CSMI+2

Largest triangle, quadrilateral, ... in circle must be inscribed...

I did these two with angle bisectors - Probably it needs to start with a convex shape and I am not quite certain of the relationship of the second to the first. (BTW: When embedding the first video, I tweaked the code so as not to take up the whole page. See how! ) media type="custom" key="8173716" media type="custom" key="8164672"