Equilateral triangle Equilateral triangle In geometry, an equilateral triangle is a triangle in which all three sides are equal. In the familiar Euclidean geometry, an equilateral triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. It is also a regular polygon, so it is also referred to as a regular triangle. Denoting the common length of the sides of the equilateral triangle as "a", we can determine using the Pythagorean theorem that: Denoting the radius of the circumscribed circle as "R", we can determine using trigonometry that: Many of these quantities
Triangle and Robert Triangle and Robert Triangle and Robert is a webcomic by Patrick Shaughnessy that ran from August 1999 to September 2007. It is about the adventures of two polygons, an equilateral triangle named 'Triangle', and a rhombus named 'Robert'. As Patrick Shaughnessy, appearing in the strip as 'the Cartoonist', has explained on many occasions, he can't draw, and he makes up the story as he goes along. All of the characters are simple shapes that he creates using a cheap paint program. More complicated objects are represented by simpler stand-ins (a sheep, for instance, appears as a rectangular placeholder marked "Insert