"Area of a Circle" Circle PPT Courseware 2

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Jiangsu Education Edition Fifth Grade Mathematics Volume 2	pptx	6 MB

"Area of a Circle" Circle PPT Courseware 2

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Upload Time: 2024-10-05

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"Area of a Circle" Circle PPT Courseware 2

What is area?

The surface of an object or the size of a plane figure is called their area.

The size of the plane occupied by a circle is called the area of the circle.

guess

1.What shapes do you think a circle can be transformed into?

2. What do you think the area of a circle is related to?

Work in a group of four, work together first, and then observe carefully:

1. What shape do the circles form?

2. What is the relationship between the area of the formed figure and the area of the circle?

1. Please carefully observe the base and height of the parallelogram and see which part of the circle they are related to?

2. How to calculate the area of this parallelogram?

3. Can you derive the formula for calculating the area of a circle based on the formula for calculating the area of a parallelogram?

Class exercises

1. Find the area of the circle according to the conditions given below.

(1) The radius is 2 cm

(2) The diameter is 0.8 decimeters

2. The radius of a circular iron plate is 3 decimeters. What is its area in square decimeters?

3. The diameter of a radar circular screen is 40 cm. What is its area in square meters?

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For more information about the "Area of a Circle" PPT courseware, please click the "Area of a Circle ppt circle ppt" tag.

"Area of a Circle" PPT courseware on the circumference and area of a circle:

"Area of a Circle" Circumference and Area of a Circle PPT Courseware Teaching Objectives 1. Experience the process of estimating the area of a dart board, hands-on operations, discussions, etc. to explore the formula for calculating the area of a circle. 2. Understand and master the formula for the area of a circle, and be able to use the formula to calculate correctly. 3. Experience the circle...

"Area of a Circle" Circle PPT Courseware 6:

"Area of a Circle" Circle PPT Courseware 6 The calculation of the area of a circle has a wide range of applications in life. Please look at the following example: To make a cylindrical bucket, Master Li needs a round piece of tinplate with a diameter of 40 cm to make the bottom of the bucket. This kind of iron sheet costs 50 yuan per square meter..

"Area of a Circle" Circle PPT Courseware 5:

"Area of a Circle" Circle PPT Courseware 5 The spray radius is 3m. If the sprinkler head rotates once, how much area of farmland can be irrigated? 3.143=3.149=28.26 (m) Answer: It can irrigate 28.26 square meters of farmland. The circumference of the circular sheepfold was measured to be 125.6m. The face of this sheepfold...

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Update Time: 2024-10-05

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"Area of a Circle" Circle PPT Courseware 2