Triangle - Wikipedia
Triangles are classified into different types based on their angles and the lengths of their sides. Relations between angles and side lengths are a major focus of trigonometry. In particular, the …
Triangles - Equilateral, Isosceles and Scalene
A triangle has three sides and three angles. The three angles always add to 180°. There are three special names given to triangles that tell how...
Types of Triangles - Definitions, Properties, Examples
There are different types of triangles in math based on their sides and angles. Learn about different types of triangles, and their classification based on the side lengths and angles, with …
Triangle | Definition & Facts | Britannica
Dec 5, 2025 · triangle, in geometry, a three-sided polygon. Triangles are formed by three line segments, sometimes called edges, whose end points intersect at points known as the …
Triangles: Types, Properties, and Formulas
Learn about the different types of triangles in geometry, their properties, and important formulas including the Pythagorean Theorem, Sine Law, Cosine Law, and area formulas.
Triangle Types and Classifications: Isosceles, Equilateral ...
Types of Triangles Isosceles, Equilateral, Scalene, Obtuse... Triangles can be classified by various properties relating to their angles and sides. The most common classifications are …
Triangles | Brilliant Math & Science Wiki
Triangles are polygons (shapes) with three sides and three angles, which can be formed by connecting any three points in a plane. They are one of the first shapes studied in geometry.