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"Projection" Projection and View PPT courseware download (Lesson 2), 11 pages in total.
Part One Content: Basic Knowledge Key Points
Knowledge point 1 Parallel projection
1. Among the following four figures, the figure representing the shadows of two Christmas trees under the sun at the same time may be (B)
2. Xiaole used a rectangular piece of cardboard to do a projection experiment in the sun. Through observation, he found that the impossible projection of this rectangular cardboard on a flat ground is (A)
A.Triangle B.Line segment
C. Rectangle D. Parallelogram
Knowledge point 2: The changing rules of shadows under sunlight
3. On a sunny day, when Xiao Yin was walking due north, she found that her figure turned to the left, then the time at that time was (A)
A.morning B.noon
C. Afternoon D. Unable to determine
4. Ming Ming went outside in the sunshine four times at 8:00, 9:30, 10:00, and 12:00 to observe the head stem of the sunflower rotating with the sun. Unintentionally, he discovered the length of the sunflower’s shadow at these four times. are different, then the moment when the shadow is the longest is (A)
A.8 o'clock B.9:30
C.10 o'clock D.12 o'clock
Projection PPT, part 2: improvement of comprehensive capabilities
8. (Changchun High School Entrance Examination) "Sun Zi Suan Jing" is an important mathematical work in ancient China. It was written about 1,500 years ago. There is a ballad in it: There is a pole today and I don't know its length. I measured the shadow to be one foot and five feet long. Set up a benchmark pole, one foot and five inches long, and its shadow is five inches long. How long is the pole? That means: There is a bamboo pole and I don’t know how long it is. Measure its shadow under the sun to be one foot and five feet long. At the same time, set up a bamboo pole. A small benchmark of one foot and five inches has a shadow length of five inches (hint: 1 foot = 10 feet, 1 foot = 10 inches), then the length of the bamboo pole (B)
A. Five feet B. Four feet and five feet
C.One foot D.Five feet
9. As shown in the picture, Xiao Ming saw the shadow of a tree at four times of the day. Please arrange them in chronological order: ④②①③.
Projection PPT, the third part: expansion, exploration and breakthrough
11. There are two upright wooden poles AB and CD next to a certain advertising wall PQ. At a certain time under the sun, the shadow of the wooden pole CD just does not fall on the advertising wall PQ.
(1) Please draw the sunlight CE and the shadow BF of the wooden pole AB at this time in the picture;
(2) If AB=4.5 meters, CD=3 meters, the distance DQ from CD to PQ is 2 meters, find the shadow length of wooden pole AB at this time.
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.
"View" Projection and View PPT Download (Lesson 2):
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"View" Projection and View PPT Download (Lesson 1):
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