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})]
- A.
6.28cm - B.
12.6cm - C.
22.6cm - D.
62.8cm
Correct Answer: Option B
Explanation
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)