"Area of ​​a Circle" Circle PPT Courseware

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"Area of ​​a Circle" Circle PPT Courseware

The rate of progress between two adjacent area units is ( )

1 square meter = ( ) square decimeter

1 square decimeter = ( ) square centimeter

Knowing what conditions can we find the area of ​​a circle?

You can find the area of ​​a circle if you know the radius, diameter or circumference.

Do it:

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

(1), radius 2 decimeters

(2), diameter 10 cm

area of ​​circle

1. Area of ​​a circle: the size of the plane occupied by the circle

2. The calculation formula for the area of ​​a circle: S= πr 2

3. The area of ​​the circle can be calculated by knowing the radius, diameter and circumference of the circle.

4. The formula for calculating the area of ​​a ring: πR2-πr2 or π(R2-r2)

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"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: 2024-11-17

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

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