Question

If the radius of a circle is halved, its circumference gets

• A. doubled
• B. tripled
• C. halved
• D. Remains same

Answer 1

The correct option is C

halved

Circumference of a circle with radius, $r$ is $2\pi r$

Now, the radius is halved, so new radius $=\frac{r}{2}$

$\Rightarrow$ New circumference $=2\times \pi \times \frac{r}{2}$

$=\pi r$

Thus, the circumference also gets halved.