Trigonometry practice problems using right triangle diagrams to calculate missing sides and angles.

Let me carefully examine the image to understand the problem. It appears to contain several geometry problems involving triangles, angle bisectors, and possibly the Angle Bisector Theorem.

Since the user has set ExplainAnswer: false, TeachTopic: false, and GeneratePractice: false, I only need to provide the final answer.

However, I need to determine what the actual question is asking. Looking at the image, there are multiple parts labeled (a), (b), (c), etc., with diagrams of triangles and some text that seems to be asking for specific values or proofs.

Let me zoom in on the first part to understand what needs to be solved.