Video summary. At the Grecian Pizza Parlour, apprentice Ambrose receives an order for 50 equilateral triangle shaped pizzas with equilateral triangle shaped toppings.

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 ...

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

The puzzle, which comes from a new book by London-based Alex Bellos, requires you to transform two triangles made from six matches into four triangles, by moving just two matches.

To solve the puzzle, the trio grouped possible dissections of an equilateral triangle based on how the cuts intersect its edges. First, they narrowed down the infinite ways to cut the triangle ...