question: A triangular prism has as dimensions those labelled on the diagram. The AB edge has length of 10. The BC edge has length of 3. The CF edge has length of 15. The EX edge and FX edge have the equal length. Find z, the size of \angle BXC, correct to 2 decimal places.
query_wo: Please directly answer the question and provide the final value, e.g., 1, 2.5, 300.
  Question: A triangular prism has as dimensions those labelled on the diagram. The AB edge has length of 10. The BC edge has length of 3. The CF edge has length of 15. The EX edge and FX edge have the equal length. Find z, the size of \angle BXC, correct to 2 decimal places.
query_cot: Please first conduct reasoning, and then answer the question and provide the final value, e.g., 1, 2.5, 300, at the end.
  Question: A triangular prism has as dimensions those labelled on the diagram. The AB edge has length of 10. The BC edge has length of 3. The CF edge has length of 15. The EX edge and FX edge have the equal length. Find z, the size of \angle BXC, correct to 2 decimal places.
question_for_eval: A triangular prism has as dimensions those labelled on the diagram. The AB edge has length of 10. The BC edge has length of 3. The CF edge has length of 15. The EX edge and FX edge have the equal length. Find z, the size of \angle BXC, correct to 2 decimal places.