California Assessment of Student Performance and Progress (CAASPP) Math Practice Exam

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What type of triangle has all sides of equal length?

Scalene Triangle
Equilateral Triangle
Obtuse Triangle
Right Triangle

The correct answer is: Equilateral Triangle

A triangle that has all sides of equal length is known as an equilateral triangle. This type of triangle not only has sides that are equal in measurement, but it also has angles that are each equal to 60 degrees. This property ensures that the triangle is symmetrical and balanced. In contrast, a scalene triangle has sides of different lengths and, consequently, different angles. An obtuse triangle is defined by having one angle that is greater than 90 degrees, which does not relate to the lengths of the sides. A right triangle contains one angle that is exactly 90 degrees, again unrelated to the lengths of its sides. Thus, the defining characteristics of an equilateral triangle set it apart from the other types of triangles mentioned.