2. circle - set of all points in a plane at a given distance from a given point in the plane

3. Parts of a Circle:

4. radius - segment from point on circle to circles center

5. center - point in middle of circle with letter next to it

6. Circles are named by their center point.

7. This circle is circle A.

8. What is the name of the circle below?

9. Circle N

10. congruent circles - circles with the same radius

11. These circles are congruent.

12. arc of a circle - two points on the circle and the unbroken part between the two points

13. arc of a circle endpoints - the two points that define an arc

14. NAMING ARCS An arc is named by its endpoints.

15. THREE TYPES OF ARCS: semicircle - arc whose endpoints are a diameter (half a circle)

16. THREE TYPES OF ARCS: semicircle - named using three points on the arc; endpoints listed first and last

17. THREE TYPES OF ARCS: The blue dashed arc is arc AOB or symbolically...

18. True or False The name of the orange arc below is…..

19. True or False FALSE…it is

20. THREE TYPES OF ARCS: minor arc - arc less than a semicircle

21. THREE TYPES OF ARCS: minor arc - named using the two endpoint letters

22. THREE TYPES OF ARCS: The blue dashed arc is arc YZ or symbolically...

23. True or False The name of the orange arc below is…..

24. True or False FALSE. It is…..

25. THREE TYPES OF ARCS: major arc - arc greater than a semicircle

26. THREE TYPES OF ARCS: major arc - named using three points on the arc with endpoints listed first and last

27. THREE TYPES OF ARCS: major arc - named using three points on the arc with endpoints listed first and last

28. THREE TYPES OF ARCS: The blue dashed arc is arc YXZ or symbolically...

29. True or False The name of the orange arc below is…..

30. True or False FALSE

31. chord A segment whose endpoints are on the circle.

32. AB is a chord.

33. diameter A chord that goes through the center of a circle.

34. CD is a diameter.

35. secant -line that goes through two points of a circle.

36. -line m is a secant

37. tangent -line that touches circle at only one point

38. -line p is a tangent

39. inscribed angle -angle made of two chords

40. -  ABC and  BCD are inscribed angles

41. central angle -angle made of two radii

42. -  COD is a central angle

43. Name each circle part as either a chord, diameter, secant, tangent, or inscribed angle.

44. tangent line

45. chord

46. secant

47. central angle  DOA

48. diameter

49. inscribed angle