Analyze the provided image and extract geometrical problem data.

The image contains 12 diagrams of circles with inscribed angles and chords. Each diagram is labeled with a number or a letter and contains geometric figures like triangles and angles marked with 'x' or specific degree values. These appear to be geometry problems related to circles and inscribed angles. The text at the bottom seems to be a legend or title for the diagrams, possibly in Russian, indicating that 'x' represents an inscribed angle and 'O' represents the center of the circle.