1. **State the problem:** We have a triangle with side lengths 11 cm, 11 cm, and 10 cm. We need to determine what kind of triangle it is. 2. **Recall triangle classification rules:** - An **equilateral** triangle has all three sides equal. - An **isosceles** triangle has exactly two sides equal. - A **scalene** triangle has all sides of different lengths. 3. **Analyze the given sides:** - Two sides are 11 cm each, and the third side is 10 cm. - Since two sides are equal and the third is different, the triangle is **isosceles but not equilateral**. 4. **Final answer:** The triangle is **isosceles but not equilateral**.