The length of an arc of a circle of radius 21 cm with central angle 60° is \(\left(\pi = \frac{22}{7}\right)\)
A. 44 cm
B. 66 cm
C. 231 cm
D. 22 cm
A. 44 cm
B. 66 cm
C. 231 cm
D. 22 cm
Best answer
Answer: D. 22 cm
\(l = \frac{60}{360} \times 2 \times \frac{22}{7} \times 21 = 22\) cm.
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