An arc of a circle subtends an angle of 60 o at the centre. If
MATHEMATICS
WAEC 2009
An arc of a circle subtends an angle of 60o at the centre. If the radius of the circle is 3cm, find , in terms of \(\pi\), the length of the arc
- A. \(\pi\)cm
- B. 2\(\pi\)cm
- C. 3\(\pi\)cm
- D. 6\(\pi\)cm
Correct Answer: A. \(\pi\)cm
Explanation
Length of arc = \(\frac{\theta}{360} \times 2\pi r\)
= \(\frac{60}{360} \times 2\pi \times 3cm\)
= \(\pi\)cm
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