Mathematics - Geometry - Transformations - Rotations - Rotation Wheel
A shape on a coordinate grid with an adjustable center of rotation (can be origin or any point). A slider controls the angle (0°-360°). As the student adjusts, the shape rotates around the center. Key rules for rotation about origin: 90° CW: (x,y)→(y,-x). 180°: (x,y)→(-x,-y). 90° CCW: (x,y)→(-y,x).