Types of triangles

The types of triangles are differ by the size of their sides and by the measure of their internal angles. Remember that the triangle is a polygon with three sides, connected by its three vertices that form three angles.

Types of triangles according to their sides

A triangle is a three-sided polygon. Depending on the measure and the relationship of the sides to each other, we have different types of triangles:

• Isosceles triangle: presents two sides of equal measure.
• Equilateral triangle: the three sides measure the same and therefore the three angles are equal.
• Scalene triangle: its three sides have different measurements.

Types of triangles according to their angles

A triangle has three internal angles, which in total add up to 180º. Depending on the measure of the angles, the triangles can be:

• Acute triangle: the 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, that is, greater than 90º.

You may also be interested in seeing Types of angles.