Properties of Rectangles

①This GeoGebra example dynamically demonstrates the fundamental properties of a rectangle, including opposite sides parallel and equal, all four angles being right angles, and diagonals equal in length and bisecting each other. ②Core mathematical concepts covered are the definition of a rectangle, parallel and perpendicular lines, angle measurement, distance calculation, and slope, linking to polygon properties and geometric construction. ③Construction details: Based on the summary, commands such as Segment, OrthogonalLine, Line, Intersect, Angle, Distance, and Slope are used to create vertices A, B, C, D and auxiliary points E, F, G, measure side lengths, diagonal lengths, and angles, and display distance values via text objects. ④This is suitable for middle school geometry or introductory high school analytic geometry, helping students verify rectangle properties interactively by dragging vertices, and can serve as a dynamic teaching demonstration.