The basic definition of rotation is that an object moves in a circle around a point or an axis. For example, the earth rotates around the earth's axis and also around the sun.

Rotation overview:

1. In mathematics, rotation is a graphic movement. In a plane, turning a figure around a fixed point by an angle in a certain direction is called rotation.

2. In other words, rotation is the phenomenon that an object moves on a circle with a point or an axis as the center, so swing is also rotation, so the movement of swing, pendulum and seesaw is swing and rotation.

3. Rotation refers to the transformation of a graph, that is, every point on the graph moves around a fixed point on the plane at a fixed angle. This fixed point is called the center of rotation and the rotation angle is called the rotation angle.

4. Rotation center, rotation direction and rotation angle are the three elements of rotation. Rotation does not change the shape and size of the graph.

Rotating drawing steps:

1, define the topic requirements, and find out the rotation center, rotation direction and rotation angle.

2. Analyze the chart and find out the key points that make up the chart.

3. Find out the corresponding points of key points, and make the corresponding points of each key point according to a certain direction and angle. The way to find the corresponding point is to connect each point with the center of rotation; With the rotation center as the vertex and the above-mentioned 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. The endpoints on these "other sides" are corresponding points.

4. Make a new figure, connect the points made in sequence, and connect the points.

5. Write a conclusion and explain the graph.