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Difference between 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 Triangle Name Characteristic
According to the size of its sides Isosceles Two sides of equal size.
Equilateral All three sides are equal in size.
Scalene The three sides have different measurements.
According to their angles Acute angle The three angles measure less than 90º.
Obtuse angle One of the angles measures more than 90º.
Rectangle One of the angles measures 90º.

Types of triangles according to their sides

types of trangules according to their sides isosceles equilateral scalene

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: has 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

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types of triangles according to angles acute angle obtuse right angle

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 to say, they are acute angles.
  • Right triangle: one of the angles of the triangle measures 90º, that is to say, 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.

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