Question

a triangle with 3 congruent sides is called a(n)________ isosceles triangle obtuse triangle equilateral triangle irregular triangle

Explanation:

An equilateral triangle is defined as a triangle with all three sides congruent (equal in length). An isosceles triangle has only two congruent sides. An obtuse triangle is classified by its angles (one angle greater than 90 degrees), not side lengths. An irregular triangle is not a standard geometric term for a triangle with specific side - related properties like congruence.

Answer:

Equilateral Triangle