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# Equilateral triangle, isosceles and scalene

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

Types of triangles Name of the Triangle characteristic
According to the size of the sides Isosceles Two sides the same size.
Equator All three sides are the same size.
scale The three sides have different sizes.
According to the angles acutangle All three angles measure less than 90º.
obtuse angle One of the angles measures more than 90º.
rectangle One of the angles measure 90º.

## Types of triangles according to the sides A triangle is a polygon with three sides. 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 the same measure.
• equilateral triangle: the three sides measure the same and therefore the three angles are equal.
• scalene triangle: its three sides have different sizes.

## Types of triangles according to the angles A triangle has three internal angles, which add up to 180 degrees. According to the measure of the angles, triangles can be:

• acute angle 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.

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