Consider the provided image showing geometric figures and mathematical notations. Identify the subject and class level based on the visual content. Then, extract and present all visible mathematical expressions, numbers, and symbols in a structured format.

Subject Analysis:

• Subject: Mathematics
• Class Level: Likely middle school or early high school, given the geometry and angle notations.

Extracted Data:

• Circle 1: Center labeled as 'O₂', an angle marked as '171°'.
• Circle 2: Center labeled as 'O₂', an arc marked with a question mark '?'.
• Circle 3: A segment is drawn within the circle, and a question mark '?' is present.
• Task Context: The images appear to be part of a geometry problem set, likely involving calculations related to angles, arcs, or segments within circles.