"Projection" Projection and View PPT courseware download (Lesson 1)

Description

"Projection" Projection and View PPT courseware download (Lesson 1), 10 pages in total.

Basic knowledge points

Knowledge point 1: The concept of center projection

1. Which of the following phenomena belongs to the central projection phenomenon (B)

A.The shadow of people walking on the road in the morning

B.The shadow of people walking under street lights at night

C.The shade of trees used to enjoy the shade at noon

D. The shadow of the flagpole on the ground when the flag is raised in the morning

Knowledge point 2: Transformation between objects and their projections under central projection conditions

2. As shown in the picture, the same height flagpole under the street light at night, the closer it is to the street light, its shadow (B)

A. The longer B. The shorter

C. Same length D. Unable to determine

Comprehensive ability improvement

5. Xiao Yang and Xiao Ming walked from a distance to the street lamp in a straight line. They stipulated that Xiao Yang was in front and Xiao Ming was in the back. The distance between them was always equal to the length of Xiao Yang’s shadow. In this case , the distance between them (D)

A. Always the same B. Getting farther and farther

C. Sometimes near and sometimes far D. Getting closer and closer

6. Brothers Da Shuang and Xiao Shuang are of the same height, but under the light, the shadow of the elder brother, Da Shuang, is shorter than that of the younger brother, Xiao Shuang. This is because the elder brother is closer to the lamp than the younger brother.

7. (Tianshui Examination) As shown in the figure, the street lamp is 8 meters away from the ground. Xiao Ming, who is 1.6 meters tall, stands at A, 20 meters away from the bottom of the lamp (point O). Then Xiao Ming's shadow AM is 5 meters long.

8. Determine the position of the street light bulb in the picture, and draw Xiao Zhao’s shadow under the light.

Expand exploration and breakthrough

9. As shown in the figure, under the street light, Xiao Ming’s height is shown as the line segment AB in the figure, his shadow on the ground is shown as the line segment AC in the figure, Xiao Liang’s height is shown as the line segment FG in the figure, and the street light bulb is shown in the line segment On DE. Please determine the location of the light bulb and draw the shadow formed by the small light under the light.

Solution: As shown in the figure, point O is the location of the light bulb, and line segment FH is the shadow formed by the light under the light.

Keywords: Beijing Normal University Edition Ninth Grade Volume 1 Mathematics PPT courseware free download, projection PPT download, projection and view PPT download, .PPT format;

For more information about the "Projection and View Projection" PPT courseware, please click on the Projection and View PPT Projection PPT tab.

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Update Time: 2024-07-03

This template belongs to Mathematics courseware Beijing Normal University Edition Ninth Grade Mathematics Volume 1 industry PPT template

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