This document discusses how to calculate the areas of circles, sectors, and segments of circles. It defines a circle as having an area of πr^2, a sector as a region bounded by an arc and two radii, and a segment as part of a circle bounded by an arc and a line joining the arc's endpoints. The document provides examples of finding the areas of full circles, sectors, and segments.

2. Essential Understanding
 You can find the area of a circle when you know its
radius. You can use the area of a circle to find the
area of a circle formed by two radii and the arc the
radii when they intersect with the circle
 Students will be able to find the areas of circles,
sectors, and segments of circles

3. Area of a Circle
 A = πr2
 What is the area of circular wrestling region with a
42 ft diameter?
 What is the area of a circular ice skating rink with a
radius of 24 ft?

4. Area of a Sector
 Sector of a circle: region bounded by an arc of the
circle and two radii to the arc’s endpoints.
 A circle has radius of 4 in. What is the area of a sector
bounded by a 45° minor arc? Leave your answer in
terms of π.

6. Segment of a Circle
 Part of a circle bounded by an arc and the segment
joining its endpoints.
 To find the area of a segment for a minor arc, draw
radii to form a sector. The area of the segments
equals the area of the sector minus the area of the
triangle formed

7. Finding Area of a Segment
 What is the area of the shaded segment shown
below? Round your answer to the nearest tenth.

9. Homework
 Pg. 663
 # 8 – 32 even, 46
 14 problems