Question

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

Answer 1

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?