Question

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

Explanation:

Step1: Recall triangle side classifications

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 unequal.

Step2: Analyze the given triangle

The triangle has all three angles marked equal (the red arcs at each vertex). In a triangle, equal angles imply equal opposite sides. So all three sides are equal.

Answer:

equilateral