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Not enough information has been given such as the height of the flask.
Density or weight is calculated by mass/volume
You take the radius (or diameter). If radius you times it by two (since it is half of the Diameter) then times the answer by 3.14. If diameter, times the diameter by 3.14. then round the decimals.
for monofilament filament, the round diameter is about 214 micron for multi filament yarn depends to cross section of fibers and the rate of twisting
The 9mm round in loaded with a bullet diameter of .356"in.
Measure its diameter.
Using the query 'diameter' assumes that the diamond is a round brilliant cut. A 2.50 carat round brilliant cut measures about 9MM at the girdle -- your diamond's diameter will be slightly shorter.
diameter = circumference/pi = 12/pi inches
234
56.52
.4005 inches.
The same way as you round any other number or measurement.