Rotation of 0-360 degrees around a center

This example demonstrates the rotation of a shape by 0-360 degrees around a fixed center point. Key mathematical concepts involved include rotation, intersection, secant line or secant, right triangles, similar triangles, and function graphs. The construction highlights the use of GeoGebra commands Polygon and Rotate, manipulating the center, vertices B, C, D, and rotation angle α to rotate polygon poly1 and its image poly1'. It also shows rotated vertices B', C', D'. This example is suitable for middle school students learning geometric transformations, trigonometric functions, and function graphing, helping them understand rotational symmetry and the principles of graphical transformations.