WARM-UP

Area of a regular polygon:________________________

Area of Circle: ______________________________

Learning Intentions:Today I will…1) Learn new vocabulary: annuluses, sectors, and

segments of circles2) 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.

…But first, are there anyquestions from worksheet 8.5

SectorA sector of a circle is the region between two radii and an arc of the circle.

SegmentA segment of a circle is the region between a chord and an arc of the circle.

Sector

AnnulusA annulus is the region between two concentric circles.

Example 2

Example 3

Example 4

Area of sector

Area of segment

Area of Annulus

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Now Practice.