Question on: JAMB Mathematics - 1990
The angle of a sector of s circle, radius 10.5cm, is 48 o, Calculate the perimeter of the sector
A
8.8cm
B
25.4cm
C
25.6cm
D
28.8cm
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Correct Option: D
Length of Arc AB = (\frac{\theta}{360}) 2(\pi)r
= (\frac{48}{360}) x 2(\frac{22}{7}) x (\frac{21}{2})
= (\frac{4 \times 22 \times \times 3}{30}) (\frac{88}{10}) = 8.8cm
Perimeter = 8.8 + 2r
= 8.8 + 2(10.5)
= 8.8 + 21
= 29.8cm
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