Question

The ratio of circumference and radius of a circle is ______ .

• A. $\pi$
• B. $2\pi$
• C. $\frac{\pi }{2}$
• D. 1

Answer 1

The correct option is B $2\pi$


Let radius of the circle be r .
Circumference of the circle $=2\pi r$
So, ratio of circumference to radius
$=\frac{2\pi r}{r}=2\pi$