Question

classify this triangle by its sides.
equilateral
isosceles but not equilateral
scalene

Explanation:

An isosceles triangle has exactly two congruent sides (marked by matching tick marks), while an equilateral triangle has all three sides congruent, and a scalene triangle has no congruent sides. The triangle shown has two sides with matching tick marks, meaning only two sides are equal.

Answer:

isosceles but not equilateral