The century is numbered. For instance the 1300's were the 13 century.
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You round up the year to the nearest hundred. The first two digits then identify the century. For example, 1066 rounds up to 1100 so it is the 11th century.
the empty figure
Because... there are ten years in a decade - therefore there are ten decades in a century ! The prefix 'dec' means ten.
Figure on one every 25 years (average as family spacing changes with culture) which gives you four per century.
The 17 hundreds were the 18th Century.(How to remember it:The years from 1 to 100 were the "first" century. So the name ofthe century is the name of the even hundred at the end of it.)
A 5 sided figure is called a: pentagon