This is a preview. Log in through your library . Abstract In this paper we present a solution to the Fall 2011 PME Journal Problem Number 1245, prepared by Stan Rabinowitz. This problem asks whether ...

Have you ever wondered why the cover of a manhole is nearly always round? Why isn’t it oval or square? Reuleaux curve based on an equilateral triangle. Reuleaux curves based on the pentagon (top) and ...

A London-based dentist has uncovered a hidden detail in Leonardo da Vinci’s famous Vitruvian Man drawing, revealing a special number connecting the iconic artwork to the human body and nature. The ...