1. The problem is to understand the length of side BC, which is given as 11 cm. 2. Since BC is a side length, no formula is needed to verify its length unless part of a larger problem. 3. If BC was previously thought to be 8 cm, but now is corrected to 11 cm, we simply accept BC = 11 cm. 4. This correction might affect calculations involving BC, such as perimeter or area if part of a polygon or triangle. 5. Always ensure to use the correct side lengths in any further calculations.