Comprehensive guide to circle geometry properties and theorems, featuring labeled diagrams and explanations for various angle relationships and symmetrical features.

A detailed educational diagram illustrating angle properties of circles, including definitions of arc, sector, segment, diameter, radius, chord, tangent, and secant, along with symmetric properties and circle theorems such as the angle at the center, right angle in a semicircle, angles in the same segment, angles in opposite segments, and alternate segment theorem.