Western Normal University Edition First Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 1
People's Education Press First Grade Mathematics Volume 1
People's Education Press Second Grade Mathematics Volume 1
People's Education Press Third Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 1
Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
Hebei Education Edition Third Grade Mathematics Volume 1
People's Education High School Mathematics Edition B Compulsory Course 2
Hebei Education Edition Seventh Grade Mathematics Volume 2
Hebei Education Edition Fourth Grade Mathematics Volume 2
Beijing Normal University Edition Fifth Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
Category | Format | Size |
---|---|---|
Qingdao Edition Ninth Grade Mathematics Volume 2 | pptx | 6 MB |
Description
"Parallel Projection" PPT courseware
learning target
1. Explore the formation of shadows of objects, identify the shadows of objects according to the direction of light, and initially experience the mutual transformation between objects and shadows under parallel projection;
2. Through accumulation of activities, understand that the size and direction of the shadows formed by objects under sunlight are different at different times.
Observe and think
Do you know what the relationship between objects and shadows is?
When an object is illuminated by sunlight or light, it will form a shadow on the ground, walls, etc. The shadow is closely related to the shape of the object.
When an object is illuminated by light, it will leave its shadow on the ground or a strong surface. This phenomenon is called projection.
The sun's rays can be regarded as parallel. When such rays shine on an object, the projection formed is called parallel projection. The light is the projection line, and the ground or strong surface is the projection surface.
Explore new knowledge
Self-study textbook P165-P166 Do it
1. Under parallel projection, what is the projection of point A in the projection plane H?
2. What is the shape of the shadow of a suspended bamboo pole on the ground? Changing the angle between the bamboo pole and the ground, what happens to their shadows?
Parallel projection properties:
When the line segment is parallel to the projection surface, the projection of the line segment is a ______, both ______ and ______; when the line segment is inclined to the projection surface, the projection of the line segment and the line segment ______ are not necessarily equal; when the endpoint of the line segment is at When on the same ray, the projection of the line segment is a ______.
Expand and extend
Self-study textbook P166 Do it
If the sun shines obliquely on the ground, what shape will be the shadow of a rectangular piece of paper on the ground?
Summarize:
Regardless of the position of the rectangular piece of paper, the shadow in the sunlight is always ______. In particular, it may be ______, but it will not be ______.
Consolidation exercises
Generally, the projections of two objects standing upright on the ground in the sun are either parallel or on the same straight line. The two objects, their parallel projections and the projection line passing through the top of the object form a right triangle respectively. These two triangles resemblance.
The flagpole stands upright at position A, and its parallel projection is as shown in the figure.
(1) Please draw the projection of Xiao Ming when he is standing at B (represented by a line segment). And explain why you drew it this way.
(2) If Xiao Ming is standing at C, please draw his projection (represented by a line segment), and compare the length of the two projections of Xiao Ming standing at B and C.
(3) What is the relationship between the height of the flagpole and the ratio of its projected length and the ratio of Xiao Ming’s height to his projected length? Why?
Keywords: Parallel projection teaching courseware, Qingdao edition ninth grade mathematics volume 2 mathematics PPT courseware download, ninth grade mathematics slide courseware download, parallel projection PPT courseware download, .PPT format;
For more information about the "Parallel Projection" PPT courseware, please click on the Parallel Projection ppt tab.
"Parallel Projection" PPT courseware 2:
"Parallel Projection" PPT courseware 2 In parallel projection, when the projection line is perpendicular to the projection plane, the projection of the geometry in the projection plane is called orthographic projection. Explore new knowledge. Place a line segment AB in three different positions: (1) The line segment is parallel to the projection surface. (2) The line segment is inclined..
File Info
Update Time: 2024-10-18
This template belongs to Mathematics courseware Qingdao Edition Ninth Grade Mathematics Volume 2 industry PPT template
"Parallel Projection" PPT courseware Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
Tips: If you open the template and feel that it is not suitable for all your needs, you can search for related content "Parallel Projection" PPT courseware is enough.
How to use the Windows system template
Directly decompress the file and use it with office or wps
How to use the Mac system template
Directly decompress the file and use it Office or wps can be used
Related reading
For more detailed PPT-related tutorials and font tutorials, you can view: Click to see
How to create a high-quality technological sense PPT? 4 ways to share the bottom of the box
Notice
Do not download in WeChat, Zhihu, QQ, built-in browsers, please use mobile browsers to download! If you are a mobile phone user, please download it on your computer!
1. The manuscript PPT is only for study and reference, please delete it 24 hours after downloading.
2. If the resource involves your legitimate rights and interests, delete it immediately.
3. Contact information: service@daogebangong.com
"Parallel Projection" PPT courseware, due to usage restrictions, it is only for personal study and reference use. For commercial use, please go to the relevant official website for authorization.
(Personal non-commercial use refers to the use of this font to complete the display of personal works, including but not limited to the design of personal papers, resumes, etc.)