Question

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

Explanation:

Step1: Recall triangle classification by sides

A triangle is equilateral if all three sides (and angles) are equal. An isosceles triangle has at least two equal sides (and angles), and scalene has all sides (and angles) different.

Step2: Analyze the given triangle

The triangle has three equal - angled marks (red arcs), which implies all three angles are equal. By the property of triangles (if all angles are equal, all sides are equal), so the triangle has all three sides equal.

Answer:

equilateral