Question

If the circumference of a circle is $40\pi m,$ then its radius is (in $m$)

• A. $20$
• B. $20\pi$
• C. $40$
• D. $40\pi$

Answer 1

The correct option is A $20$

Given,
Circumference $=40\pi$
We know that
Circumference $=2\pi r,$ where $r$ is the radius of the circle
$40\pi =2\pi r40=2rr=\frac{40}{2}\Rightarrow r=20m$