Circle
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Transcript of Circle
![Page 1: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/1.jpg)
Finding the circumference of a circle.
![Page 2: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/2.jpg)
We discovered that if you take a circles diameter and put it round the outside of a
circle it goes around 3 and a bit times.
![Page 3: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/3.jpg)
This 3 and a bit has been worked out. It is actually a very long number. It is called Pi. It
also has a special symbol.
We will be using 3.14
![Page 4: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/4.jpg)
So, to find the circumference of a circle we can take the diameter of a circle and multiply
it by Pi.
C = πd !
Can you show a formula of how you can find the circumference of a circle from its radius.
![Page 5: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/5.jpg)
You can find also find the circumference by taking the radius, doubling it (this will give you the diameter and then multiply it by Pi.
C = 2πr !!
![Page 6: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/6.jpg)
Use 3.14 for PiRadius Diameter Circumference
(Calculated)Circumference
(Measured) Difference
4cm
8cm
5cm
6.5cm
7cm
18cm
12cm
15cm
20cm
![Page 7: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/7.jpg)
![Page 8: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/8.jpg)
![Page 9: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/9.jpg)
![Page 10: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/10.jpg)
![Page 11: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/11.jpg)
![Page 12: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/12.jpg)
![Page 13: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/13.jpg)
![Page 14: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/14.jpg)
![Page 15: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/15.jpg)
![Page 16: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/16.jpg)
![Page 17: Circle](https://reader034.fdocuments.us/reader034/viewer/2022052621/558b3fb4d8b42a76488b4602/html5/thumbnails/17.jpg)
Extension
• Finding a radius/diameter when given a circumference.
• Finding the circumference of a semi-circle, quarter circle.