Question on: WAEC Mathematics - 2006
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})]
A
6.28cm
B
12.6cm
C
22.6cm
D
62.8cm
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Correct Option: 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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