The ratio of the perimeter (circumference) and diameter of a circle is

(a) $π$ (b) 2 $π$ (c) $\frac{π}{2}$ (d) $\frac{π}{4}$

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Solution

Let r be the radius of the circle. Then
Perimeter of circle = 2 $π$ r
Diameter of circle = 2r
Now
$\frac{Perimeter of circle}{Diameter of circle} = \frac{2 π r}{2 r} = π$
Thus, the required ratio is $π$ .
Hence, the correct option is (a)

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