1. Circle Terminology

2. Circle The set of points in a plane that are a fixed distance from a given point called the center of the circle.

3. A circle is labeled by its center. Circle A A B Circle B C Circle C

5. Chord A segment joining two points on a circle Example: AB A B

6. Diameter A chord that passes through the center of a circle. Example: AB A B

7. Name the following:

10. , or GO

11. What is the relationship between the radius and the diameter?

12. If you said: The diameter is twice the radius. The radius is half of the diameter. You are absolutely correct.

13. What is the………

14. Radius = 7 cm Diameter = 14 cm

16. Radius = 13 km Diameter = 26 km

17. 1.What circle has a diameter of 7 mm? 2.What circle has a radius of 7 km? 3.What circle has a diameter of 8 m? 4.What circle has a radius of 12 m? 5.If the circles were drawn to scale, which circle would be the smallest?

18. 1.What circle has a diameter of 7 mm? Circle J 2.What circle has a radius of 7 km? Circle B 3.What circle has a diameter of 8 m? Circle E 4.What circle has a radius of 12 m? Circle G 5.If the circles were drawn to scale, which circle would be the smallest? Circle J