Question

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

Explanation:

Step1: Recall triangle side classifications

• Isosceles: At least 2 equal sides.
• Equilateral: All 3 sides equal (a special isosceles).
• Scalene: All sides different.

Step2: Analyze the triangle's marks

The triangle has two sides with double tick - marks (equal) and one side with a single tick - mark (different from the double - ticked sides). So, it has 2 equal sides (so isosceles) but not all 3 equal (so not equilateral). It can't be scalene (scalene has all sides different) or equilateral (needs all 3 equal).

Answer:

A. isosceles but not equilateral