The sexagesimal system was created by theMesopotamians, 4000 years ago. They were the first to divide the circle in 360 degrees.
The French with Napoleon, in the XIX century, introduced the decimal system. They tried to apply it to angles, making the right angle measure 100º instead of the regular 90º. But mathematicians said no to that idea.
If you understand a bit of trigonometry, you will know why...
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The decimal point. However, in many European countries, a "decimal comma" is used instead.
The same as real numbers are expressed in decimal, except only the digits 0 and 1 are used (instead of 0 to 9) and the separator between the integer and fraction part is called the binary point (instead of the decimal point). The sign if needed is the same as in decimal.
In most of Europe the , acts as the decimal point. For example €6,99 is 6 euros and 99 cents. In other countries, like Ireland, the full stop is used: €6.99 instead.
Because it is a point that is used in the decimal system of counting. Decimal means based on ten.
Decimal places are used in mathematics for the same reasons that commas are used. Decimal places are used to break up large numbers in order to make them easier to read.