The reason there is a limit on the size of a single living cell is the mass to surface area ratio. The membrane is where oxygen is exchanged and molecules diffuse and are transported. A membrane will increase linearly with the diameter but the internal volume will increase to the cube of the diameter so at some point there is not enough membrane to service the large amount of living 'stuff' in the cytoplasm.
an ostrich egg
Trinity test, 5 foot diameter sphereHiroshima, 4 foot diameter 10 foot lengthNagasaki, 5 foot diameter 10 foot length
A linear foot is the same as a foot. So, an 18-foot diameter circle would measure 18 linear feet in diameter!
Single cells are the smallest cells that can preform all of the function in life and cannot be seen without a microscope. The above answer should say most cells can not be seen without a microscope. There are exceptions to this rule as say a chicken egg or 2 foot long strands of neurons are also single cells.
The square foot area of a 41-foot diameter circle is: 1,320 square feet.
The circumference of a 27-foot diameter circle is about 84.82 feet. (diameter x Pi = circumference).
The diameter of a circle with a 12-foot circumference is about 3.82 feet. (circumference divided by Pi = diameter).
The formula is pi times diameter. If the diameter is 1 foot, times 3.14, the circumference will be 3.14 feet.
if 4 foot is the circumference then the diameter is 4/pi = 1.27323954
The circumference of a 8 foot diameter circle is about 25.13 feet.
The circumference of circle with 60-foot diameter is: 188 feet.
The circumference of a 19 foot diameter circle is: 59.7 feet.
What is the spacing around a 14 foot diameter for 35 items?