A) \[\pi :1\]
B) \[1:\pi \]
C) \[1:2\]
D) \[2:1\]
Correct Answer: A
Solution :
[a] \[\frac{\text{Circumference}}{\text{Diameter}}=\frac{2\pi r}{2r}=\frac{\pi }{1}=\pi :1\]
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