A) \[\text{2 }\!\!\pi\!\!\text{ a units}\]
B) \[\text{ }\!\!\pi\!\!\text{ d units}\]
C) \[\text{2 }\!\!\pi\!\!\text{ d units}\]
D) \[\frac{\text{2 }\!\!\pi\!\!\text{ }}{a}\text{ units}\]
Correct Answer: A
Solution :
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