Its own. The US is one of a small number of recalcitrant countries that has not adopted the metric system. Furthermore, it had not adopted the Imperial standard either, with the US gallon, for example, being different from elsewhere in the world at that time.
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We need standard measurements because it helps us to find the measurements of things.
Measurements need to be specific so we use significant digits.
I don't know, that's why i asked !!:DD I'm guessing its some kind of two measurements!xD
There are two main systems of measurements in mathematics, metric and US standard. Metric measurements are terms like centimeters, and US standard includes inches and feet.
Metric measurements use powers of 10. Any other system has NO bases or logic.