There's no such thing as the "area of a circumference", no matter how you spell it.
A circumference is a length, representing the distance around a circle, and doesn't
have an area.
If you know the circumference of a circle, and you call it 'C', then the area of the circle is
C2 / (4 pi)
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3.14159265359783
Circumference is the total distance around a circle. It's the length of the perimeter.
Calculate the area of the room. Calculate the area of the window (or whatever opening) Room Area*100/Window Area
It is not possible to calculate the area given only the volume.
Average area