"Cylinder Theme Picture" Cylinder and Cone 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!
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Authoritative PPT Summary
"Cylinder Theme Picture" Cylinder and Cone PPT Courseware
1. Review old knowledge
The cubes and cuboids we have learned are three-dimensional figures surrounded by planes.
2. Explore new knowledge
If you stick a rectangular piece of hard paper on a wooden stick and quickly rotate the wooden stick, think about it, what shape will it turn out?
The length of the rectangle is equal to the circumference of the base of the cylinder, and the width is equal to the height of the cylinder.
3. Application of knowledge
(1) Do it
Rotate rectangle ABCD to generate the two cylinders on the right. Tell us which side of the rectangle they are rotated around, and what are the base radius and height.
Please think about it first. If rectangle ABCD is rotated with side AB as the axis, which cylinder will it form? Please give it a try.
(2) Solve problems
1. A cylindrical tea bucket has a trademark paper on the side. The radius of the bottom of the cylinder is 5cm and the height is 20cm. This trademark paper unfolds into a rectangle. What are its length and width in centimeters?
Please think about the relationship between the length of the rectangle and the base of the cylinder? What is the width of the rectangle?
2. Which of the following figures are expanded views of a cylinder (unit: cm)?
Answer: (1) Yes. Because the circumference of the circle is 2×3.14=6.28 (cm), which is equal to the length of the rectangle, it is an expanded view of the cylinder.
(2) No. Because the circumference of the circle is 4×3.14=12.56 (cm), and the length of the rectangle is 20cm, the length of the rectangle is longer than the circumference of the circle, so it is not an expanded view of a cylinder.
(3) No. Because the length of the rectangle is equal to the diameter of the circle, it is not an expanded view of a cylinder.
4. Assign homework
Homework: Do it on page 18, question 1. Exercise 3 on page 20, questions 1, 2, and 4.
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