The reason the shape changes from 3D to 2D when you get to six triangles has to do with the number of degrees in an equilateral triangle. There are 60 degrees at each vertex of the triangle, so ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Pascal’s triangle is a never-ending equilateral triangle of numbers that follow a rule of ...

Learn about angles in triangles and quadrilaterals with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

Henry Dudeney, a self-taught English mathematician and puzzle columnist, asked his readers to dissect an equilateral triangle into the smallest number of pieces that could be rearranged into a square.

"The triangle in the northwest Valley was probably Luke Air Force Base Auxiliary Field 1. That is part of an old airfield that is now used for instrument training by F-16 pilots. There was another ...