Question on: JAMB Mathematics - 2016
An arc of the length 16(\pi)cm subtends an angle of 80o at the centre of the circle. Find the radius of the circle.
A
24cm
B
28cm
C
36cm
D
32cm
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Correct Option: C
L = (\frac{\theta}{360}) x 2(\pi)r
16(\pi) = (\frac{80}{360}) x 2(\pi)r
(\frac{16\pi \times 360}{80 \times 2\pi}) = r
r = 36cm
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