"How Big is an Ice Cream Box" PPT Courseware 4

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"How Big is an Ice Cream Box" PPT Courseware 4

Self-study tips:

1. Study the textbooks by yourself and know the names of each part of the cylinder;

2. Summary of group discussion: What are the characteristics of a cylinder?

What is the difference between the two cylinders?

The distance between the two bases of a cylinder is called the height.

Countless

What are the characteristics of a cylinder?

The upper and lower faces of the cylinder are exactly the same circle

The cylinder has countless heights

A cylinder has a curved side surface

Think and discuss:

1. What shape will be obtained by cutting the side of the cylinder along the height?

2. What is the relationship between this figure and the parts of the original figure?

3. What other shapes can be obtained by unfolding the sides of the cylinder?

think

There are rectangles, parallelograms, and arbitrary figures when unfolded on the side. So which figure should we study?

Can they be converted into the same shape?

Length of rectangle = perimeter of base of cylinder

Width of rectangle = height of cylinder

Area of ​​rectangle = side area of ​​cylinder

Characteristics of cylinders:

1. There are two bottom surfaces:

2. One side: length = circumference of bottom surface

3. There are countless heights

judge right or not.

1. The height of the cylinder is only one line. ( )

2. The diameters of the two bases of the cylinder are equal. ( )

3. When the circumference and height of the base of the cylinder are equal, the unfolded side surface must be a square. ( )

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Update Time: 2024-09-29

This template belongs to Mathematics courseware Qingdao Edition Sixth Grade Mathematics Volume 2 industry PPT template

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