To name a triangle we often use its vertices (the name of the endpoints). The triangle below is named ABC. A triangle has three angles. The sum of the measures of the angles is always 180° in a triangle.
Triangles are named according to the measures of its sides and the size of its angles (corners).
Explanation:
There are three types of triangle based on the length of the sides: equilateral, isosceles, and scalene. The green lines mark the sides of equal (the same) length.
