6.28cm
12.6cm
22.6cm
62.8cm
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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