Question

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

Explanation:

Step1: Recall triangle classification by sides

A scalene triangle has all sides of different lengths (different tick marks), an isosceles has at least two equal sides (same tick marks), and an equilateral has all three equal (all same tick marks).

Step2: Analyze the triangle's tick marks

The triangle has three different tick mark patterns (one mark, two marks, three marks), meaning all three sides are of different lengths.

Step3: Match to classification

A scalene triangle has all sides unequal, which matches the triangle here. "Isosceles but not equilateral" requires at least two equal sides (same tick marks), and "equilateral" requires all three equal (same tick marks), which don't match.

Answer:

scalene