1. The problem is to classify a triangle by its sides based on the given information. 2. Triangles are classified by their sides as follows: - Equilateral: all three sides are equal. - Isosceles (but not equilateral): exactly two sides are equal. - Scalene: all three sides are different. 3. Since the triangle has three purple sides and three red angle marks, but no side lengths are given, we must rely on the visual clues. 4. The presence of three red angle marks suggests all angles are equal, which implies all sides are equal. 5. Therefore, the triangle is equilateral. 6. Final answer: The triangle is **equilateral**.