You'll be using Sketch 1 of this file which has three different types of triangles - scalene, isosceles, equilateral. Each triangle type has a different colour (pink for scalene, red for equilateral, ...

In 1946, ErdÐ â s himself posed a riddle about what are called “isosceles sets”: How many points can you place in d -dimensional space such that any three of them form an isosceles triangle?

An isosceles triangle with one angle greater than 90° is an obtuse-angled triangle. An isosceles triangle with angles of 100°, 40° and 40° is an obtuse-angled triangle.

A triangle is a three-sided shape, where the sides are straight and meet at three vertices. The prefix "tri" means three. There are several types of triangles. Do you know what they are?

Explore the triangle area formula, its derivation, and practical examples to master this essential geometric concept effortlessly.

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