Answer:

Step-by-step explanation:
Let's start by finding the radius of this circle.

Note that in the equation:

"A" stands for area and "r" stands for radius.
Now, let's substitute the given values into the equation.

Here, the number is = 9/15/18
We can re-write it as: 9 /15*18 = 9/270 = 1/30
In short, Your Answer would be 1/30
Hope this helps!