Chord and Diameter: Geometric Construction in a Circle

① This example illustrates the geometric relationship between a chord and a diameter in a circle, demonstrating that the perpendicular bisector of a chord passes through the circle's center and that the diameter bisects the chord. ② Core mathematical concepts include circle elements (center, radius, diameter, chord), the chord bisector theorem, midpoint and perpendicularity, and segment proportions. ③ Construction uses GeoGebra commands: Circle, Line, Point, Segment, Midpoint, Intersect, with text objects for labeling key points. ④ Suitable for middle and high school students and teachers learning circle properties, geometric proofs, or using dynamic geometry for exploration and demonstration.