# 5 Types of Triangles

Triangles are a fundamental part of geometry. They are two-dimensional shapes that have three sides and three angles. There are several types of triangles that can be classified based on their sides and angles. In this article, we will discuss 5 types of triangles.

## 1. Equilateral Triangle

An equilateral triangle is a type of triangle that has three equal sides and three equal angles. The three angles of an equilateral triangle are all 60 degrees. Equilateral triangles have a high degree of symmetry, and their sides and angles are congruent. Equilateral triangles are commonly used in mathematics, engineering, and architecture.

## 2. Isosceles Triangle

An isosceles triangle is a type of triangle that has two equal sides and two equal angles. The third angle of an isosceles triangle is different from the other two angles. Isosceles triangles have a line of symmetry through the angle that is different from the other two angles. The angle that is different from the other two angles is called the vertex angle.

## 3. Scalene Triangle

A scalene triangle is a type of triangle that has three different sides and three different angles. None of the angles of a scalene triangle are equal, and none of the sides are equal. Scalene triangles do not have any lines of symmetry, and they have no congruent angles or sides.

## 4. Right Triangle

A right triangle is a type of triangle that has one right angle, which is equal to 90 degrees. The other two angles of a right triangle are acute angles, which are less than 90 degrees. The side opposite the right angle is called the hypotenuse, and it is the longest side of the right triangle. Right triangles are commonly used in trigonometry and mathematics.

## 5. Obtuse Triangle

An obtuse triangle is a type of triangle that has one angle that is greater than 90 degrees. The other two angles of an obtuse triangle are acute angles, which are less than 90 degrees. The side opposite the obtuse angle is the longest side of the obtuse triangle. Obtuse triangles do not have any lines of symmetry, and they have no congruent angles or sides.