1. 7.7: Areas of Circles and Sectors
Objective:
To find the areas of circles, sectors and segments of circles

2. Area of a Circle:
r = radius length MUST USE RADIUS WHEN FINDING AREA!!!

3. How much more pizza is in a 12-in. diameter pizza than in a 10 in
How much more pizza is in a 12-in. diameter pizza than in a 10 in. diameter pizza?

4. Find the area of each circle. Leave your answer in terms of1. 2.
12.5 m
30 ft

5. Find the area of the circle. Round your answer to the nearest tenth.

6. Area of a Sector of a Circle
Region bounded by an arc and 2 radii
Name using an arc endpoint, the center of the circle, and the other endpoint
It is a fraction of the circle’s AREA A r B O

7. Area of a Sector:
Area of a sector = measure of the arc • 360

8. Find the area of each sector. Leave your answers in terms ofK A
72◦
20cm
5 ft. B J O O

9. 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:
n Area of Sector – Area of Triangle

10. Find the area of each segment. Round your answer to the nearest tenth.