An arc subtends an angle of 30o at the centre o... - JAMB Mathematics 2016 Question
An arc subtends an angle of 30o at the centre of a circle radius 12cm. Calculate the length of the arc.
A
6\(\pi\)cm
B
2\(\pi\)cm
C
3\(\pi\)cm
D
9\(\pi\)cm
correct option: b
Length or arc = (\frac{\theta}{360}) x 2(\pi)r
= (\frac{30}{360}) x 2 x (\frac{22}{7}) x 12
= (\frac{1}{12}) x 2 x (\pi) x 2 = 2(\pi)cm
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