Question

If the radius of a circle is increased by $3$ times then the diameter increases by ____times.

• A. $4$
• B. $6$
• C. $3$
• D. $8$

Answer 1

The correct option is C $3$

We know,

when radius $=r$, the diameter of circle = $2r$.

Now, when radius $=3r$, the diameter of circle = $2\left(3r\right)=6r$, i.e. increased by $3$ times.

That is, if the radius is increased by $3$ times, then the diameter also increases by $3$ times.

Hence, option $C$ is correct.