1. Warm UP!
Circle O has a radius of 20 feet. What is the length of arc KL? K
65o O L
20 ft

2. Area of
6.8
Circles & Sectors

3. The amount of space inside a circle.
Area of a Circle
The amount of space inside a circle. r
A= πr2

4. Find the area.
53 cm
7.6 yd
181.5 square yards
square cm
A= πr2

5. Find the area of the shaded region.
Example 2
Find the area of the shaded region.
A = π22
A = π 82
A = π 4
A = π 64
2 in
A = in2
A = in2
6 in
A shaded = A – A= =
188.49in2

6. Sector
the region bounded by two radii of the circle and their intercepted arc.

7. Area of a Sector
WHY?

8. How Do You Find the Area
of a Circular Sector?

9. Find the area of the sector.
Example 3
Find the area of the sector. R
6 cm 60 Q
A = cm2

10. Find the area of the sector.
Example 4
Find the area of the sector.
6 cm
120
7 cm Q R
A  cm2