Hello!
Answer:

Explanation:
The formula to calculate the area of a circle is:

Where:

We know that the area of our circle is:

So we have this equation, where we want to solve r:

Let's solve r in this equation:

◼ Divide both sides by π:

◼ Simplify both sides:

◼ We know that if
, then
:

◼ Simplify both sides:

The radius can't be negative so the radius is equal to 2.