"Area of ​​a Circle" Circle PPT Courseware 3

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"Area of ​​a Circle" Circle PPT Courseware 3

memory consolidation

(1) What is the area of ​​a circle?

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

(2) What is the formula for calculating the area of ​​a circle? What conditions are needed to calculate the area of ​​a circle?

The circumference of a round table is measured to be 3.14 meters. What is the area of ​​this round table in square meters?

Think: To find the area of ​​a circle, you need to know the radius of the circle. Only the circumference of the circle is given in the question. What do you need to find first?

1.What are the area and circumference of a circle?

2. What is the formula for calculating the area of ​​a circle? What is the formula for the circumference of a circle?

3. What is the difference between the circumference of a circle and the area of ​​a circle?

judge

(1) The circumference of the circle is 6.28 decimeters, then the circumference of the semicircle is 3.14 decimeters. ( )

(2) The line segment connecting a point inside a circle and any point on the circle is called the radius. ( )

(3) The diameters and radii of all circles are equal. ( )

(4) Pi is the quotient of the diameter and circumference of a circle. ( )

(5) If the radius of a circle is expanded three times, its circumference will be twice as large as the original. ( )

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For more information about the "Area of ​​a Circle" PPT courseware, please click on the Circle PPT Area of ​​a Circle PPT tab.

"Area of ​​a Circle (2)" Circle PPT courseware download:

Download the circle PPT courseware "Area of ​​a Circle (2)" Part One: Classroom Introduction 1. Master the formula for calculating the area of ​​a circle. 2. Be able to use the knowledge of circle area to solve some simple practical problems. 3. Experience the idea of ​​turning a curve into a straight line, and initially experience the idea of ​​extremes. ... ... ....

"Area of ​​a Circle (2)" Circle PPT teaching courseware:

"Area of ​​a Circle (2)" Circle PPT Teaching Courseware Part One: Preparation before class Learning focus: Use the area calculation formula of a circle to solve simple practical problems. Learning difficulty: Use the area calculation formula of a circle to calculate the area of ​​a more complex combined figure containing a circle. ..

"Area of ​​a Circle (2)" Circle PPT download:

"Area of ​​a Circle (2)" Circle PPT Download Part One: Review Introduction The size of the plane occupied by a circle is called the area of ​​the circle. What is the formula for the area of ​​a circle? S=r What is the derivation process of the area formula of a circle? The area formula is to fold the circle in half, divide it into two semicircles, and divide each...

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Update Time: 2024-09-09

This template belongs to Mathematics courseware Jiangsu Education Edition Fifth Grade Mathematics Volume 2 industry PPT template

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