Named for Plato, who theorized that the classical elements were made of these regular polyhedrons, three of the Platonic solids are composed of equilateral triangles: the tetrahedron, octahedron, and ...

Discusses the properties and types of triangles, explaining that a triangle is a closed figure with three sides and angles. It categorizes triangles into equilateral, isosceles, scalene, obtuse, right ...

Problem 5 is all about triangles and figuring out how they fit together. Maths teacher Chris Smith and pupils from Grange Academy are here to explain. The Maths Week Scotland Daily Challenges have ...