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Parts of a Circle :

circle - set of all points in a plane at a given distance from a given point in the plane. Parts of a Circle :. radius - segment from point on circle to circles center. A. center - point in middle of circle with letter next to it. A.

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Parts of a Circle :

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

  2. Parts of a Circle:

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

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

  5. A Circles are named by their center point.

  6. A This circle is circle A.

  7. O E What is the name of the circle below? N Y M

  8. O E Circle N N Y M

  9. congruent circles - circles with the same radius

  10. 13mm These circles are congruent. 13mm

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

  12. endpoints - the two points that define an arc arc of a circle A B

  13. NAMING ARCS An arc is named by its endpoints. A B

  14. THREE TYPES OF ARCS: semicircle - arc whose endpoints are a diameter (half a circle) O B A

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

  16. THREE TYPES OF ARCS: The blue dashed arc is arc AOB or symbolically... O AOB B A

  17. True or False The name of the orange arc below is….. PR Q R P

  18. True or False FALSE…it is PQR RQP Q R P

  19. THREE TYPES OF ARCS: minor arc - arc less than a semicircle Y Z X

  20. THREE TYPES OF ARCS: minor arc - named using the two endpoint letters Y Z X

  21. THREE TYPES OF ARCS: The blue dashed arc is arc YZ or symbolically... YZ ZY Y Z X

  22. True or False The name of the orange arc below is….. KLM k L M J

  23. True or False FALSE. It is….. KM MK k L M J

  24. THREE TYPES OF ARCS: major arc - arc greater than a semicircle Z X Y

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

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

  27. THREE TYPES OF ARCS: The blue dashed arc is arc YXZ or symbolically... YXZ ZXY Z X Y

  28. True or False The name of the orange arc below is….. LOU U D O L

  29. True or False FALSE LOD DOL LUD DUL U D O L

  30. chord B A A segment whose endpoints are on the circle.

  31. chord B A AB is a chord.

  32. diameter B A A chord that goes through the center of a circle. C D

  33. diameter B A CD is a diameter. C D

  34. secant B A -line that goes through two points of a circle. C D m

  35. secant B A -line m is a secant C D m

  36. tangent B A -line that touches circle at only one point C D m p

  37. tangent B A -line p is a tangent C D m p

  38. inscribed angle B A -angle made of two chords C D m p

  39. inscribed angle B A -ABC and BCD are inscribed angles C D m p

  40. central angle -angle made of two radii C O D

  41. central angle -COD is a central angle C O D

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

  43. tangent line

  44. chord

  45. secant

  46. D O central angle DOA A

  47. A diameter

  48. A inscribed angle

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