"Understanding of Circles" Circle and Sector PPT Courseware

Description

"Understanding of Circles" Circle and Sector PPT Courseware

teaching objectives

1. Combine with specific objects and experience the process of understanding circles.

2. Understand the characteristics of a circle and the names of its parts, and understand the relationship between diameter and radius in the same circle.

3. Develop spatial concepts through activities such as observation, operation, and imagination.

There are many objects around us that have round faces, such as coin faces, clock faces, round tables, the top and bottom of tea tubes, etc.

What other objects can you name that have round faces?

Observe the characteristics of a circle: a closed figure surrounded by curves with no vertices.

Discuss

1. How many diameters and radii does a circle have? How are they related?

2. What is the difference between a circle and the shapes we have learned before?

In the same circle, there are () diameters and their lengths are ().

In the same circle, there are () radii, and their lengths are ().

In the same circle, the diameter is twice the radius and the radius is half the diameter.

give it a try

1. Use the following method to measure the diameter of a circle without a center.

2. Measure the lengths of several line segments in the circle below. what have you found?

practice

1. Find the radius or diameter of each circle below and express it with a letter.

2. Draw the radius or diameter as required and use letters to indicate the measurement.

Have you noticed? Sewer manhole covers are all round. Do you know why?

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For more information about the "Understanding of Circles and Sector-shaped Circles" PPT courseware, please click on the "Understanding of Circles and Sector-shaped Circles" ppt tag.

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File Info

Update Time: 2024-09-22

This template belongs to Mathematics courseware Hebei Education Edition Sixth Grade Mathematics Volume 1 industry PPT template

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