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"Rotation of Graphics" Rotation PPT Courseware 2
rotating concept
In a plane, a figure is rotated by an angle around a fixed point in a certain direction. Such figure transformation is called rotation (Circumrotation).
This fixed point is called the center of rotation, and the angle of rotation is called the angle of rotation.
Three elements of rotation:
Rotation center, rotation direction, rotation angle.
Properties of rotation:
1. During the rotation of the graphics, what has changed? What has not changed?
2. Connect the corresponding points A, D and the rotation center O respectively, and measure the line segments OA and OD. What is their relationship? Find any pair of corresponding points and measure the line segments connecting them to the rotation center. What can you find? law?
3. Measure the degree of ∠AOD, then find any pairs of corresponding points, and measure the degrees of the line segments connecting the corresponding points and the center of rotation. What rules can you find?
Practice in class
1. Which of the following phenomena belong to rotation ( )
① The groundwater level decreases year by year; ② The movement of the conveyor belt; ③ The rotation of the steering wheel; ④ The rotation of the faucet switch; ⑤ The movement of the pendulum; ⑥ The movement of the swing.
A.2 B.3 C.4 D.5
2. Which of the following statements is correct ( )
A. Rotate to change the shape and size of the graphic
B. Translation changes the position of the graphic
C. Graphics can be rotated a certain distance in a certain direction
D. The graphics obtained by translation must also be obtained by rotation
Keywords: Rotation courseware, rotation courseware of graphics, New People's Education Edition ninth grade mathematics PPT courseware, ninth grade mathematics slide courseware download, rotation PPT courseware download, rotation of graphics PPT courseware download, .ppt format
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