Types of Triangles

They are distinguished by the size of their sides and by the measure of their internal angles. It is important to mention that the triangle is a polygon with three sides, joined by its three vertices that make up three angles.

Types of triangles according to their sides

It is a three-sided polygon, depending on the size and the relationship of the sides to each other, there are different types of triangles:

Isosceles Triangle – Shows two sides of equal length.
Equilateral triangle : all three sides have the same measure, therefore all three angles are equal.
Scalene triangle : its three sides have other measures.

Types of triangles according to their angles

A triangle has three interior angles that total 180º. According to the measure of the angles, the triangles are the following:

Acute triangle : all three angles measure less than 90º, that is, they are acute angles.
Right triangle : one of the angles of the triangle measures 90º, that is, it is a right angle.
Obtuse triangle : one of the angles is an obtuse angle, therefore it is greater than 90º.

Types of Triangles

types of triangles	Triangle Name	Characteristic
It depends on the size of its sides.	Isosceles	Both sides equal in size.
	Equilateral	All three sides are the same size.
	Scalene	The three sides have different measurements.
According to your angles	acute angle	All three angles measure less than 90º.
	obtuse angle	One of the angles measures more than 90º.
	Rectangle	One of the angles measures 90º.