use a compash
you can.
The 9 foot ceiling is simply one more foot in height above the previously stated 8 foot ceiling. One could assume that a man who is 8'7" could only comfortably live under a 9 foot ceiling.
It varies. Some have 8 foot ceiling with 1 foot floors=9 foot some have 8 foot ceiling with 2 feet floors=10 feet
A 13-foot circle has an area of 132.73 square feet.
A 16-foot circle has an area of 201.06 square feet.
It depends on what you mean by a 7 foot circle.
The circumference of 5 foot circle is: 15.7
You should clarify whether "1-foot circle" refers to a circle with a radius of 1 foot, a diameter of 1 foot, or a circumference of 1 foot. The circumference of a circle is equal to the diameter times pi (approximately 3.14).
140 feet.
A circle with a 27-foot diameter has an area of 572.56 square feet.
A 36" fan should be adequate. Mount it at least a foot from the ceiling (18" is better) and run it reversed, to draw the cool air up from the floor and spread it around the room. That will also reduce drafts and dust.
The circumference of a 160-foot circle is: 503 feet.