Question

classify this triangle by its sides.

isosceles but not equilateral

scalene

equilateral

Explanation:

Step1: Recall triangle classification by sides

Triangles are classified by sides as equilateral (all 3 sides equal), isosceles (at least 2 sides equal), or scalene (all sides different). The marks on the triangle's sides indicate equal sides.

Step2: Analyze the given triangle

The triangle has three equal - length marks (each side has one mark, and all marks are the same type), meaning all three sides are equal.

Answer:

equilateral