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Published byPoppy Francis Modified over 9 years ago
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o A B AOB = Sector / Juring = Arc / Busur ARC SECTOR Arc lengths and Areas of Sectors Created by ﺠﻴﻄ for Mathlabsky.wordpress.com
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Areas of sectors O 180 0 Example : Area of circle = 40 cm 2 A B Area of sector AOB = ? AOB = 20 cm 2
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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 = ….?
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O a0a0 P Q FORMULA
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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
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P Q O 60 0 A = 60 cm 2 1.
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K L O 120 0 2. r = 7 cm
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O A B C D a0a0 b0b0
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O A B C D 80 0 120 0 Exercise: AOB = 20 cm 2, COD = ….?
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Arc lengths Example : Circumference of circle = 24 cm Arc length AB = ? O 180 0 B A AB = 12 cm
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O Q P Example : Circumference of circle = 24 cm Arc length PQ = ? PQ = 6 cm M N O a0a0
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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
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1. Circumference of circle = 36 cm O B A 100 0
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2. Radius of circle = 7 cm 240 0 A B O
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O A B C D a0a0 b0b0
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O A B C D 80 0 Example : Find arc length CD if arc length AB = 40 cm 100 0 Let arc CD = x
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