"Understanding of Fan Shape" Circle and Fan Shape PPT Courseware

Description

"Understanding of Fan Shape" Circle and Fan Shape PPT Courseware

teaching objectives

1. During activities such as observation, discussion, and judgment, experience the process of initially understanding the sector.

2. Know the fan shape, have a preliminary understanding of the characteristics of the fan shape, and be able to draw the fan shape in the circle.

3. Understand the relationship between the fan shape and the circle, and know the names of each part of the fan shape.

Observe the colored parts of each circle and tell us what their shapes look like?

Talk about it

What are the characteristics of a fan shape?

Each sector has an angle, and the vertex of the angle is the center of the circle.

A sector is bounded by two radii and a curve on the circle.

In the picture on the left, the part between points A and B on the circle is called an arc. Pronounced: arc AB.

The vertex is at the center of the circle and ∠AOB composed of two radii is called the central angle.

What is the relationship between the central angle and the size of the sector?

(1) Draw sectors with different central angles: Draw sectors with central angles of 30°, 60°, 90° and 120° in the same circle.

①Draw a circle.

②Draw the central angles of 30°, 60°, 90° and 120°.

Conclusion: In the same circle, the size of the sector is related to the size of its central angle. If the central angle is large, the corresponding fan shape will be large; if the central angle is small, the corresponding fan shape will be small.

In conclusion

1. A sector is bounded by two radii and a curve on the circle.

2. In the same circle, the sector with a larger central angle is larger, and the sector with a smaller central angle is smaller.

practice

1. In which of the following figures is the colored part a fan shape?

2. Draw sectors of different sizes in the circle below and color them.

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For more information about the "Understanding of Circles and Sectors" PPT courseware, please click the "Understanding of Circles and Sectors" ppt tag.

"Understanding of Fan Shape" Circle and Fan Shape Flash Animation Courseware:

"Understanding of Fan Shape" Flash Animation Courseware of Circles and Fan Shapes This courseware belongs to the teaching materials of the first unit of the sixth grade mathematics volume of the Hebei Education Edition. The flash animation courseware of circles and fan shapes is the understanding of fan shapes. The content is vivid and vivid. Please download it! Keywords: Circle and sector teaching courseware, fan...

"Understanding of Fan Shape" Circle PPT Courseware 2:

"Understanding of Sector" Circle PPT Courseware 2 Definition of Sector: A figure surrounded by a radius of ( ) and ( ) is called a sector. Explore: What factors are related to the size of the sector. 1. The fan-shaped radii of the shaded parts above are equal but the central angles are different. What are their areas?

"Understanding of Fan Shape" Circle PPT Courseware:

"Understanding of Sector" Circle PPT Courseware Summary: Characteristics of a circle: 1. It is a flat curved figure; 2. It has a center (center point o); 3. It has a radius (r) and a diameter (d): the same circle (or equal (circle), there are countless radii, all of the same length; there are countless diameters..

File Info

Update Time: 2024-11-22

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

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