1. The problem is to classify a triangle by its sides. 2. Triangles can be classified as: - Equilateral: all three sides are equal. - Isosceles: exactly two sides are equal. - Scalene: all three sides are different. 3. The given triangle has two sides marked as equal, which means it has exactly two equal sides. 4. Therefore, this triangle is an isosceles triangle but not equilateral. 5. Final classification: **Isosceles but not equilateral**.