Final answer:
A triangle can be classified by its sides into equilateral, isosceles, or scalene.
Step-by-step explanation:
A triangle is classified by its sides into three categories: equilateral, isosceles, or scalene.
An equilateral triangle has all three sides equal in length. In other words, all the sides have the same measure. For example, if side AB has length 5 units, then side BC and side AC would also have lengths of 5 units each.
An isosceles triangle has two sides that are equal in length. The remaining side is called the base. For example, if side AB and side AC have the same length of 5 units, and side BC has a different length, then the triangle is isosceles.
A scalene triangle has no sides of equal length. Each side has a different measure. For example, if side AB has length 4 units, side BC has length 5 units, and side AC has length 6 units, then the triangle is scalene.