The area of circle is halved when its radious is decreased by n. What can be the value of radious of the circle

Question

anonymous · Answer

The formula for the area of a circle is:

$A = \pi r^2$

Let's say the radius here is 10.

$A = \pi (10^2)$

$A = 100\pi$

Half of this would be $50 \pi$.

Let's plug this into the formula for the area:

$A = \pi r^2$

$50\pi = \pi r^2$

$50 = r^2$

$r = \sqrt{50}$

$r \approx 7.07$

Now we subtract 10 - 7.07 What do you get?