A diameter is a line and can be measured in any units of length although some may be more useful units than others. The diameter of a galaxy may be measured in light years, that of a ferris wheel in metres, a car tyre in centimetres, etc. The diameter of a galaxy may be measured in centimetres but you'll simply end up with a very large number.
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The circumference of a circle with a 28 unit diameter is: 88cir=dx22/7
There is no such unit of measurement as a diameter, a diameter is the length across something. Perhaps you are thinking of a decimetre.
In the context of length, a unit is a measure of distance, whereas a square unit is a measure of area.
I suggest you measure the DVDs radius (or measure its diameter and divide that by 2). Then you can use the formula for the area of a circle.
Given an atom with diameter of 100 picometers, the diameter in inches is 4 nano inches.
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First of all it's "What unit of measurement would you use to measure the diameter of a drink can?" Secondly you would probably use either centimeters or inches, depending on where you are in the world.
millimetres or mm
milimetersMilliliter
centimetres or inches
The mathematical equation which describes how to measure the distance from Earth to the moon using Earth's diameter as a unit of measure is d = Dcot(p/2)/2 Where d is the distance from Earth to the moon, D is the diameter of the Earth and p is the angle of parallax subtended at moon by the diameter of the Earth.
You should clarify what you want to measure about it: its diameter, mass, weight, color, etc. If you want to measure its diameter, that would usually be specified in microns (= micrometers).
Millimeters.
A circle can have a unit of length which could be either a measure of its diameter or radius, or of its circumference. Or the circle could have the unit of area.
Diameter is not a unit of measure. It would be like asking how many inches in 1 highway. However, decimeter is a unit of measure. One decimeter is equal to one-tenth of a meter. There are 3.937 inches in a decimeter.