这道题怎么解---**Question Stem:** In triangle ABC, point D is on side BC. AD is a line segment. **Given Conditions:** DC = 2BD ∠ADC = 60° ∠B = 45° **Question:** Find ∠C = ? **Chart/Diagram Description:** Type: Geometric figure (Triangle) Main Elements: - A triangle ABC with vertices labeled A, B, and C. - A point D is located on the side BC. - A line segment AD connects vertex A to point D. - The point D is marked on the line segment BC. - The diagram illustrates the setup described in the problem statement. - The angles ∠B and ∠ADC are shown implicitly in the configuration. - The side lengths relationship DC = 2BD is not visually represented with specific lengths but is given as a condition.