1. Circles

2. A circle is the set of all points in a plane that are at a given distance from a center. What is it?

4. Parts of a Circle Center The midpoint of a circle is

5. Parts of a Circle Circumference The outside of the circle is called

6. Parts of a Circle Diameter Diameter (must go through the center) The line that divides the circle into 2 equal parts.

7. Parts of a Circle Radius Radius (half a diameter – from the outside to the center) The line drawn from the centre to the circumference is …

8. Parts of a Circle Sector Sector (like a slice of pizza)

9. Parts of a Circle Chord A line that connects one point on the edge of the circle with another point on the circle but not through the center is called ….

10. Parts of a Circle Segment Segment (looks a bit like an orange segment) Is a part of the circumference of the circle.

11. Parts of a Circle Arc Arc (part of the circumference)

12. Parts of a Circle Tangent Tangent (a line that touches the circle at a single point on the circumference

13. Parts of the Circle centre radius diameter chord arc

14. Parts of a Circle Semicircle Semicircle (half a circle)

15. What is this? Radius

16. Semicircle

17. Center

18. Diameter

19. Chord

20. Sector

21. Circumference

22. Segment

23. Tangent

24. Diameter

25. Sector

26. Semicircle

27. Segment

28. Chord

29. Tangent

30. Arc

31. Homework: Learn these words (meanings & spellings)

32. Here are some pictures made with circles, both art and nature!!

41. On paper make this simple circles picture Your turn:

42. Draw a circle.

43. Make the second circle like this: with its center at a circumference point on the first circle, and ending at the center of the first circle.

44. Make the third circle like this: with its center at the intersection of the first two circles, and ending at the center of the first circle.

45. Keep making circles like that last one, until you have six circles surrounding the center one.

46. You can now color

47. Add build on your design