UnitMath FAQ ( Miscellaneous )
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diameter: 6 inch pm 1/16 inch;
radius: diameter / 2;
area: pi sq radius as sq cm ~ ( 179. to 182. to 186. ) sq cm
This is particularly important with precision; for example 1.0 feet and 6.0 inches do not have the same precision.
Using the above values to find the volume of a sphere ( 4/3 pi r^3 ) we get three very different answers based on the data we use:
4/3 pi cu ( 1/2 foot ) ~ 15. liter
4/3 pi cu ( 6.0 inch ) ~ ( 14.5 to 15.2 ) liter
4/3 pi cu ( 1.0 foot/2 ) ~ ( 12.7 to 17.2 ) liter
Equations are much easier to understand and less likely to have errors if they use variables with descriptive names. For example, compare the same calculation with and without variables.