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Different measuring systems use different units of measurement. The United States still uses feet and inches simply because it has not converted to the system used by the rest of the world.
They are a measure of volume in the old system of measurement - except in the US, where they still use it!
We have to communicate with other people so we need to use the same system, in all the world the most common is the metric system. Americans like to use their system (for example, they use feet, inches..), it's not the best way to communicate with others! UK is predominantly metric in weight and volumes but still will uses imperial for distance /measuring now but may still used So it is necessary to use the same system, I have already said the best one (most common hence useful) is the metric system.
The term linear foot just means that you are measuring in a straight line. It's still the same length, a linear foot is a foot, 12 inches.
A hand is an ancient measurement still used in measuring the height of horses. 1 hand = 4 inches 11 hands = 11 x 4 = 44 inches. As there are 12" in 1 foot then 44" = 3' 8" or 3⅔ feet.