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What type of triangle is defined as having three congruent sides?
Isosceles triangle
Equilateral triangle
Scalene triangle
Acute triangle
The correct answer is: Equilateral triangle
A triangle defined as having three congruent sides is known as an equilateral triangle. In this type of triangle, all sides are not only equal in length but also all interior angles are equal, measuring 60 degrees each. This unique property differentiates equilateral triangles from others, as isosceles triangles, while having two equal sides, do not require all three sides to be congruent. Scalene triangles are characterized by all sides being of different lengths and having different angles, while acute triangles can have different side lengths but must have all angles measuring less than 90 degrees. Thus, the defining characteristic of having three equal sides clearly identifies the triangle as equilateral.