A triangle is a polygon. It is a closed 3-sided shape made up of straight lines. The ‘tri-’ part of the word triangle means three. A triangle has 3 sides and 3 angles. Interior angles are the angles ...

Welcome to The Riddler. Every week, I offer up problems related to the things we hold dear around here: math, logic and probability. Two puzzles are presented each week: the Riddler Express for those ...

Earlier today I asked you to construct a triangle whose existence seems to defy reason. Show that there is a triangle, the sum of whose three heights is less than 1mm, that has an area greater than ...

Summer officially arrives at 2:46 a.m. EDT on June 21 (11:46 p.m. on June 20 for those living in the Pacific Time Zone). And as darkness falls this week, the famous "Summer Triangle" can be found low ...