1. The problem is to classify a triangle by its sides based on the given description. 2. Triangles are classified by their sides into three types: - Equilateral: All three sides are equal. - Isosceles: Exactly two sides are equal. - Scalene: All three sides are different. 3. The triangle described has two sides marked as equal with red double slashes, indicating it has exactly two equal sides. 4. Therefore, this triangle is an isosceles triangle but not equilateral. 5. Final classification: **Isosceles but not equilateral**.