1. o A B AOB = Sector / Juring = Arc / Busur ARC SECTOR Arc lengths and Areas of Sectors Created by ﺠﻴﻄ for Mathlabsky.wordpress.com

2. Areas of sectors O 180 0 Example : Area of circle = 40 cm 2 A B Area of sector AOB = ? AOB = 20 cm 2

3. O A B Example : Area of circle = 40 cm 2 Area of sector AOB = ? AOB = 10 cm 2 O a0a0 A B Area of sector AOB = ….?

4. O a0a0 P Q FORMULA

5. Exercise: 1. Given area of circle 60 cm 2, find the area of sector POQ! P Q O 60 0 2. Find the area of sector KOL if radius = 7 cm! K L O 120 0 Click the sector for solve

6. P Q O 60 0 A = 60 cm 2 1.

7. K L O 120 0 2. r = 7 cm

8. O A B C D a0a0 b0b0

9. O A B C D 80 0 120 0 Exercise: AOB = 20 cm 2, COD = ….?

10. Arc lengths Example : Circumference of circle = 24 cm Arc length AB = ? O 180 0 B A AB = 12 cm

11. O Q P Example : Circumference of circle = 24 cm Arc length PQ = ? PQ = 6 cm M N O a0a0

12. Exercise: Find arc length AB 1. Circumference of circle = 36 cm 2. Radius of circle = 7 cm 240 0 A B O O B A 100 0 Click the arc for solve

13. 1. Circumference of circle = 36 cm O B A 100 0

14. 2. Radius of circle = 7 cm 240 0 A B O

15. O A B C D a0a0 b0b0

16. O A B C D 80 0 Example : Find arc length CD if arc length AB = 40 cm 100 0 Let arc CD = x