Question

If the circumference of a circle is $\frac{30}{\pi }$, then the diameter of the circle is:

• A. $60\pi$
• B. $\frac{15}{\pi }$
• C. $\frac{30}{{\pi }^2}$
• D. $30$

Answer 1

Answer: (C)

$\frac{30}{{\pi }^2}$

Since, $Circumference=\frac{30}{\pi }$

$\Rightarrow 2\pi r=\frac{30}{\pi }\Rightarrow$$2r=\frac{30}{{\pi }^2}$