An arc subtends an angle of 72\(^o\) at the centre of a circle. Find the...
MATHEMATICS
WAEC 2019
An arc subtends an angle of 72\(^o\) at the centre of a circle. Find the length of the arc if the radius of the circle is 3.5 cm. [Take \(\pi = \frac{22}{7}\)]
- A. 6.6 cm
- B. 8.8 cm
- C. 4.4 cm
- D. 2.2 cm
Correct Answer: C. 4.4 cm
Explanation
Length = \(\frac{\theta}{360}\) x 2\(\pi\)r
= \(\frac{72}{360} \times 2 \frac{22}{7} \times \frac{0.5}{3.5}\)
= 4.4
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