圆柱的表面积2教时（The surface area of the cylinder is 2）The teaching plan of the period of the cylindrical surface area 1
Advocate: the date of zhang ju's teaching date, 2012电视背景墙颜色
The teaching content
Lesson 21-22: example 3 and "practice a practice", practice 6, 1, 2.
A total of a few hours
2
Class type
Ask:
How many hours
假期余额不足
老祖母1
3 d object
1. Understand the meaning and calculation method of the cylinder side area and surface area in operation and exploration activities, and calculate the side area and surface area of the cylinder by using the formula correctly.
2. To further accumulate the experience of exploring
three-dimensional graphic calculation methods in activities, enhance the spatial concept and develop mathematical thinking.
3. Make students experience the learning value of
three-dimensional graphics in the process of solving practical problems with the calculation method of cylindrical side area and surface area, improve the interest of learning mathematics and the confidence to learn mathematics well.
Teaching important points
Difficult point
On the basis of intuitionistic operation, understand the meaning of the cylinder side area and surface
area, understand and deduce the calculation method of the surface area and surface area of the cylinder.
Difficulty: flexible u of side area and surface area calculation according to different practical problems.
Teaching resources
Student experience: before, the students have known the ba and side of the cylinder, have a preliminary understanding of the surface part of the cylinder, and have the preparation for understanding. In addition, students also have the ability to operate, obrve, compare, and reason in the first place. The are the strategies and methods for the success of this cour.
Teaching preparation: cylindrical shaped cans with open
trademark paper outside; Multimedia.
Prepare design
立可以组什么词A, outline
植物王国观后感
What are the characteristics of columns?
2. Find a cylindrical tin can, along the am, cut off the trademark paper to e what shape it is.
3. What is the relationship between the long and the width of the rectangle after the expansion?
Ii. Learning experience.
The program design
Navigation strategy
Correction and reflection
1. Exchange preview homework (pret 3 minutes)
嘴唇起泡怎么办
The first group will exchange the preview homework, then the whole class will communicate.
Ii. New development (2 minutes pret)
封标Students identify learning content and learning goals.
3. Attempt to solve and share the extraction (12 minutes)
(1) to explore the calculation method of cylinder side area
1. Each group takes out its own cylindrical cans and discuss the calculation methods in the group.
2. Students exchange calculation methods.
Spread along the am of the trademark paper, get a rectangle of trademark paper, measure its length and width, and then calculate its area.
3. Calculation
4. Discussion: the area of the trademark paper is the area of the cylinder.
5. The students realized that the long rectangle was the ba circumference of the cylinder, and the width was the height of the cylinder.
6. Students calculate the area of the trademark paper.
Student communication: how do you do that? What's the first thing? What is it?
8. The area of the cylinder is equal to the circumference of the ba
9. Feedback exercis: complete "practice a practice" problem
1
(2) explore the calculation method of cylindrical surface area
1. Students think and discuss according to the question:
How many sides does this cylinder have?
What are the figures?
How big are each graphics?
2. The whole class communicated and reached connsus.
3. Find the square paper on the book and try to draw a picture.
4. Group communication:
学汉语
What is the surface area of a cylinder? What's the surface area of a cylinder?
Summary: the lateral area of the cylinder and the sum of the two bottom areas are called the surface area of the cylinder.
The surface area of the cylinder = the area of a ba circle by 2 + the lateral area of the cylinder.
5. The students independently calculate the surface area of the cylinder.
6. Talk about the process of your thinking.
