Page 15 - Grab Me SPM Add Mathematics Form 4,5

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Given the arc length AB is 6 cm. Find
REMEMBER (a) the angle q, in radians,
(b) the angle q, in degrees.
Minor
Major sector Minor arc
sector Solution
180°
(a) s = rq (b) q = 0.75 ×
π
8q = 6 q = 42.97°
O
q = 0.75 rad

Major arc Chord Example 3
Segment
The diagram below shows a sector AOB with
Example 2 centre O and a radius of 5 cm.
A O
The diagram below shows a sector AOB with θ 5 cm
centre O and a radius of 8 cm.
A B
8 cm
C
6 cm θ O
Find the perimeter of the shaded segment ACB for
each of the following values of q.
B (a) 2.09 rad (b) 144°
121

Ch 1_Grab Me SPM AddMaths F5.indd 121 13/05/2022 9:06 AM