"n factorial" is the product of such numbers.
Answer:

Step-by-step explanation:
To solve this problem, we can use the area of a circle formula as shown below:

<em>A = area</em>
<em>r = radius</em>
<em />
First we need to find the radius.
The radius is half of the diameter. For this problem, the radius is going to be 3.
Now, plug the values into the equation:


The window's area is 
Answer:

Step-by-step explanation:
I took a picture of how to do it instead of typing it all out so it's easier to understand!! Click on it to get full view!! If you have any questions let me know!!
Hope this helps!! If so please mark brainliest and rate/heart to help my account if it did!!