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The extraordinary shape Circle. Why circle is extraordinary? Circle is much different shape from the...
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Transcript of The extraordinary shape Circle. Why circle is extraordinary? Circle is much different shape from the...
![Page 1: The extraordinary shape Circle. Why circle is extraordinary? Circle is much different shape from the others because: It has no sides Has infinity.](https://reader036.fdocuments.in/reader036/viewer/2022072006/56649d0d5503460f949e2bc7/html5/thumbnails/1.jpg)
The extraordinary shape
Circle
![Page 2: The extraordinary shape Circle. Why circle is extraordinary? Circle is much different shape from the others because: It has no sides Has infinity.](https://reader036.fdocuments.in/reader036/viewer/2022072006/56649d0d5503460f949e2bc7/html5/thumbnails/2.jpg)
Why circle is extraordinary?Circle is much different shape from the
others because: It has no sides Has infinity axis of symmetry. Have other parameters then other figures.
![Page 3: The extraordinary shape Circle. Why circle is extraordinary? Circle is much different shape from the others because: It has no sides Has infinity.](https://reader036.fdocuments.in/reader036/viewer/2022072006/56649d0d5503460f949e2bc7/html5/thumbnails/3.jpg)
Parameters of circle1. The middle of circle – We mark it with
letter „O” or „S”2. Diameter – We mark it with letter „D”. It
passes through the middle of the circle, it’s straight and her points are on the circle’s line.
3. Radius – It’s just the half of the diameter. We mark it with letter „R” and it goes from the middle of circle to the circle’s line.
![Page 4: The extraordinary shape Circle. Why circle is extraordinary? Circle is much different shape from the others because: It has no sides Has infinity.](https://reader036.fdocuments.in/reader036/viewer/2022072006/56649d0d5503460f949e2bc7/html5/thumbnails/4.jpg)
Perimeter and Area of circleHow to count the perimeter of circle?
P = 2 πrO – perimeter
Pi number = 3,14r = radius of the circle
How to count the area of circle?
P = πr2
![Page 5: The extraordinary shape Circle. Why circle is extraordinary? Circle is much different shape from the others because: It has no sides Has infinity.](https://reader036.fdocuments.in/reader036/viewer/2022072006/56649d0d5503460f949e2bc7/html5/thumbnails/5.jpg)
Checking taskCount the area of circle when the radius is
6 cm.We must use the definition here.
P = 3,14 x 62P = 3,14 x 36
P = 113,04 cm2The area of circle is 113,04 cm2
![Page 6: The extraordinary shape Circle. Why circle is extraordinary? Circle is much different shape from the others because: It has no sides Has infinity.](https://reader036.fdocuments.in/reader036/viewer/2022072006/56649d0d5503460f949e2bc7/html5/thumbnails/6.jpg)
Task 2Count the perimeter of circle when the
radius is 9 cm. (In some cases you can use the
symbol π instead of number 3,14) O = 2 πr
O = 18 πThe perimeter is 18 π cm.
![Page 7: The extraordinary shape Circle. Why circle is extraordinary? Circle is much different shape from the others because: It has no sides Has infinity.](https://reader036.fdocuments.in/reader036/viewer/2022072006/56649d0d5503460f949e2bc7/html5/thumbnails/7.jpg)
Thank You for watching!
Jakub Samul