1. W ARM - UP Area of a regular polygon:________________________ Area of Circle: ______________________________

3. Learning Intentions: Today I will… 1)Learn new vocabulary: annuluses, sectors, and segments of circles 2)Discover formulas and methods for calculating the area of annuluses, sectors, and segments of circles. Success Criteria: I am successful if… 1)I can identify and apply the appropriate formula for an annulus, sector or segment of a circle. 2)I can complete at least 80% of my practice problems.

6. Sector A sector of a circle is the region between two radii and an arc of the circle.

7. Segment A segment of a circle is the region between a chord and an arc of the circle. Sector

8. Annulus A annulus is the region between two concentric circles.

10. Example 2

11. Example 3

12. Example 4

13. Area of sector Area of segment Area of Annulus Area of Annulus Click for Video!

14. Now Practice.