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.