Question

If the circumference of a circle increases from $4\pi to 8\pi$, what change occurs in its area?

• A. It doubles
• B. It triples
• C. It quadruples
• D. It is halved

Answer 1

Answer:

C. It quadruples

When the circumference is doubled, it means radius of circle is doubled,

as circumference $=2\pi{r}$

Since, area $=\pi{r^2}$

,it will quadrupled.