Question

If the radius of a circle gets doubled, its diameter gets ______.

Answer 1

Let the radius of the circle be $r$

We know that the diameter of a circle is twice its radius.

Hence, Daimeter $=2\times r=2r$

Now, new radius $=2r$

$\Rightarrow$ New diameter $=2\times 2r=4r$

Thus, diameter also gets doubled. (1 mark)