帮我根据图片中的问题来生成教学指导---**题目** 如图，在△ABC中， ∠ABC = 60°， AB = 2√2，D是边AC的中点，E是边BC上一点.若DE平分△ABC的周长，则DE的长为______. **Geometric Figure Description** * **Type:** Geometric figure, specifically a triangle with an internal line segment. * **Main Elements:** * Triangle ABC with vertices labeled A, B, and C. * Side lengths and angles are implied by the problem description (∠ABC = 60°, AB = 2√2). * Point D is located on side AC. * Point E is located on side BC. * Line segment DE connects points D and E. * **Relative Position:** D is on AC, E is on BC. DE is a segment inside the triangle connecting AC and BC. * **Annotations:** Vertices A, B, C, and points D, E are labeled.