| Category | Format | Size |
|---|---|---|
| People's Education Press Ninth Grade Mathematics Volume 1 | pptx | 6 MB |
"Rotation of Graphics" Rotation PPT courseware
Description
"Rotation of Graphics" Rotation PPT courseware
Rotating a plane figure by an angle around a certain point O in the plane is called the rotation of the figure.
Point 0 is called the center of rotation.
The angle of rotation is called the angle of rotation
If point P on the graph becomes point P′ after rotation, then these two points P and P′ are called the corresponding points of this rotation.
Discuss
As shown in the figure, if the pointer of the clock is regarded as a quadrilateral AOBC, it rotates around point O to obtain a quadrilateral DOEF. During this rotation process:
(1) What is the center of rotation? The center of rotation is O
(2) After rotation, where do points A and B move to? The positions of point D and point E
(3) What is the rotation angle? ∠AOD and ∠BOE are both rotation angles
(4) What is the relationship between the length of AO and DO? What about BO and EO? AO=DO，BO=EO
(5) What is the relationship between ∠AOD and ∠BOE? ∠AOD=∠BOE
Basic properties of rotation
1. The distance between the corresponding point and the center of rotation is equal
2. The angle between the corresponding point and the line segment connected to the center of rotation is equal to the angle of rotation.
3. The graphics before and after rotation are congruent (the rotation does not change the size and shape of the graphics)
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
Thinking: What determines the rotation of graphics?
The rotation of the graphic is determined by the center of rotation and the angle of 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
For more information about the "Rotation of Rotated Figures" PPT courseware, please click the Rotate ppt label of Rotated ppt graphics.
"Rotation of Plane Figures" PPT Courseware 3:
"Rotation of Plane Figures" PPT Courseware 3 Think about it. What common characteristics do the rotation phenomena in the above scenario have? During the rotation of the hands and swings of the clock, their shapes and sizes...
"Rotation of Plane Figures" PPT courseware 2:
"Rotation of Plane Figures" PPT Courseware 2 Observation and Thinking 1. Observe how the hands of the clock in Figure 1 move from OA to OB position? 2. Observe the rotation process of the hands of the clock in Figure 2. Please tell how the blades of the windmill move from OM turns to the ON position? 3. As shown in the figure, the triangle AOB is...
"Rotation of Plane Figures" PPT courseware:
"Rotation of Plane Figures" PPT Courseware Understanding Rotation Rotation of Figures Point A revolves around point __, toward the direction of ____, and rotates __ degrees to point B. In a plane, a figure is rotated by an angle around a fixed point in a certain direction. Such figure motion is called...
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Update Time: 2024-07-02
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