$The diagram shows an arc MN of a circle, centre O, with 10cm. If < MON = 72o. calculate the length of the arc, correct to three significant figures. [Take $\pi = \frac{22}{7}$]$

The diagram shows an arc MN of a circle, centre O, with 10cm. If < MON = 72^o. calculate the length of the arc, correct to three significant figures. [Take $\pi = \frac{22}{7}$ ]

6.28cm

12.6cm

22.6cm

62.8cm

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Correct answer is B

Length of arc = $\frac{\theta}{360 \times 2 \pi r}$

= $\frac{72}{360} \times 2 \times \frac{22}{7} \times 10$ cm

= 12.57

= 12.6cm(3 s.f)

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The diagram shows an arc MN of a circle, centre O, with 10cm. If < MON = 72^o. calculate the length of the arc, correct to three significant figures. [Take $\pi = \frac{22}{7}$ ]

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The diagram shows an arc MN of a circle, centre O, with 10cm. If < MON = 72^o. calculate the length of the arc, correct to three significant figures. [Take $\pi = \frac{22}{7}$ ]