Cut the Knot
Cut the Knot!: Polygons: Formality and Intuition
This is a very interesting site about polygons. The site begins by distinguishing between shapes whose sides intersect and polygons whose sides do not overlap. After this short introduction, you will find information regarding area and...
Ed Koday
Web Archive: Harelequin Bug
This black, shield-shaped bug is brightly colored with orange, red, and yellow markings. It varies from 7 to 10 mm in length. At rest, the front pair of wings overlap and the insect's back appears to be marked with a distinct "X."