The diagram shows an arc MN of a circle, centre O, with 10cm. If o. calculate the length of the arc, correct to three significant figures. [Take \(\pi = \frac{22}{7}\)]
Attached Figure / Diagram
A
6.28cm
B
12.6cm
C
22.6cm
D
62.8cm
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
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)
Source: Myschool Past Questions Archive (Record #36213)