WARM-UP Area of a regular polygon:________________________ Area of Circle: ______________________________ 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. Sector A sector of a circle is the region between two radii and an arc of the circle. Segment A segment of a circle is the region between a chord and an arc of the circle. Sector Annulus A annulus is the region between two concentric circles. Example 2 Example 3 Example 4 Click for Video! Area of sector Area of segment Area of Annulus Now Practice.