1. Warm Up: Do at the beginning of 12.3 notes
Find the area (in terms of pi) of a circle with radius 14
Find the radius of a circle with Area of 135

2. Sector Area 12.3

3. What is a sector? A sector of a circle is a region bounded by
two radii of the circle and their intercepted arc.
In other words, a sector of a circle is a section
of the circle or “piece of the circle.”
Below is an example … sector ABC.

4. How do you find the area of a sector?

5. Find the area of each sector
Find the area of each sector. Give answers in terms of  and rounded to the nearest hundredth.
sector HGJ
= 52.4 m2  m2

6. Find the area of each sector
Find the area of each sector. Give answers in terms of  and rounded to the nearest hundredth.
sector ABC
 1.74 ft2  5.45 ft2

7. A windshield wiper blade is 18 inches long
A windshield wiper blade is 18 inches long. To the nearest square inch, what is the area covered by the blade as it rotates through an angle of 122°?
 345 in2

8. Cut and Match

9. Find the radius of a circle that has a sector area of 1
Find the radius of a circle that has a sector area of 1.5pi and central angle of 120 degrees

10. Find the measure of the central angle
of a circle that has a sector area of 4.6 and radius of 3.

11. Assignment
Worksheet- sector area only