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On the rotation of mathematics in the fifth grade
General steps of rotating drawing:

(1) Find relevant points on known graphs;

(2) Make the corresponding points of these points, and find the corresponding points as follows: connect each point with the rotation center; Taking the rotation center as the vertex and the connecting line as one side, the other side of the angle in the rotation direction is equal to rotation, and the length of the other side is equal to the length from the corresponding line segment to the rotation center, and the endpoints of these "other sides" are corresponding points;

③ Connect the corresponding points in turn.