Here is the link. keywords: [Mathematics] [Geometry] [Trigonometry] [sin(x) / x] [sin x / x] [limit is 1] [limit is unity] [fundamental inequality] [inequalities]

A Reuleaux triangle is a curve of constant width other than a circle. Here is the link to the Wikipedia article on this topic. keywords: [Mathematics] [Geometry] [counter-intuitive results] [counterintuitive results] [arc of a circle] [equilateral triangle]