Correct Answer: Option B

Explanation

θ = 30 x 2(∠ at center twice ∠ at circumference)
∴ θ = 60°
Length of arc = \(\frac{\theta}{360}\times 2\pi r\)
= \(\frac{60}{360}\times 2 \times \frac{22}{7}\times \frac{21}{1}\)

= 22cm

There is an explanation video available below.

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