This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
Bisecting angle technique is based on: 
Select and explain. 
A. Geometric theorem, B. Imaging principle, C. Both of the above, D. None
A: Geometric theorem
Answer: A: Geometric theorem 
Explanation: The bisecting-angle technique is based on a simple geometric theorem,  Cieszynski’s rule of isometry, which states that two triangles are equal when they share one complete side and have two equal angles.