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Usually people use the metric system, some (like people of the United States) use the English system.
Mainly the metric system with SI units, although there are some exceptions. Distances are still in miles, beer in pints (though not other liquids), and mass (or weight) is generally measured in pounds.
The unit measured in is degrees, the tool used is a protractor. In some branches of mathematics, angles are also measured in "radians".
Anything which is solid can be measured in Milligrams. 1 gm = 100 mgs 1 kg = 1000 gms Drugs for instance, are usually measured in milligrams
Virtually nothing is measured in hectograms. Things are measured in kilograms (= 10 hectograms) or grams (= 0.01 hectograms), and the result given to the appropriate number of decimal places.