1. Geometry Chapter 9 Section 1 Circles

2. Circle The set of all points in a plane that are a given distance from a center point Radius a line segment from the center point to the edge (on the) of a circle Diameter A line segment that has both endpoints on the circle and passes throough the center point

3. Circle Center Point radius Diameter

4. Circle Chord: a line segment with both endpoints on the circle Circumference: distance around the circle the ratio of the circumference to the diameter of a circle

6. All Radii are congruent W E G F J

7. Exact Circumference the circumference measured in terms of π If D = 12 then C = 12π If r = 8 then C = 16π

8. Name a Circle with it’s Center Point G Circle G

9. Name The circle 2 chords 2 radii a diameter W E G F J

10. Given Circle W Name If WF = 5 Find the measure of FG W E G F J

11. Do Now Page 449 6 – 8, 14 - 31