1. Lesson #30
Circles.

2. Let’s concentrate and get our minds
A…round
This concept!

3. Yep…Circles are round…
And they have some very unique
Properties…

4. Like… The distance from one side to the other,
passing through the centre,
is called
the diameter.

5. Half of that…
Is called the
Radius.

6. That makes the diameter…
Twice as big as the Radius
Right…

7. As the diameter grows longer…
But there’s more…
As the diameter grows longer…

8. So does the…
Circumference.

9. Yep, the Circumference…the distance all the way around a circle!

10. 3 times As a matter of fact…
The Circumference increases a little more than
3 times
the size of the diameter.

11. Most math calculations use…
3.14 to represent this increase.
Scholars (and students)call 3.14 PI

12. Well, if you take the circumference
Why 3.14 ???
Well, if you take the circumference

13. Of any circle… And then divide it by the diameter…
You will get something VERY close to 3.14
Depending on the accuracy of your measuring tape.

14. Try it at home…
It really works.

15. The diameter is 2 times the radius.
Sooooooo.
The diameter is 2 times the radius.
The radius is half the diameter.

16. The circumference divided by the diameter = 3.14
That means that the diameter times 3.14 = the circumference, right.

17. It also means that the diameter…
Times 3.14 =
The
Circumference!

18. Lettuce use some abbreviations…
R= Radius
D = Diameter
C = Circumference
3.14= Pi

19. You must be ready… for 10 practice questions.

20. Question # 1
R= 8
D = ?

21. Question # 2
D = 10
R = ?

22. Question # 3
D = 10
C = ?

23. Question # 4
C = 314
D = ?

24. Question # 5
R = 1
C = ?

25. Question # 6
C = 31.4
R = ?

26. Question # 7
R = 50
C = ?

27. Question # 8
D = 1000
C = ?

28. Question # 9
C = 3140
D = ?

29. Question # 10
C = 6.28
R = ?

30. And now the answers.
Prepare
Yourself !

31. Question # 1
R = 8
D = 16

32. Question # 2
D = 10
R = 5

33. Question # 3
D = 10
C = 31.4

34. Question # 4
C = 314
D = 100

35. Question # 5
R = 1
C = 6.28

36. Question # 6
C = 31.4
R = 5

37. Question # 7
R = 50
C = 314

38. Question # 8
D = 1000
C = 3140

39. Question # 9
C = 3140
D = 1000

40. Question # 10
C = 6.28
R = 1

41. Almost… The
End

42. People do not wake up one morning and know how to play
Remember…
People do not wake up one morning and know how to play A
Guitar!
It takes
Practice!

43. Now…
The
End