It basically means the total space inside a 2-D object. The calculations vary between objects.
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The cubic space inside a shape
The same as it is in normal terms. A region in maths is just a selected area. e.g. A region on a graph
The number of people living in an area or country or state or city.
principal(in terms of math)- the amount you borrow or deposit
in simple math terms it is the length times height of a 2 dimension object the units are squared so if the length is five in and the height is 4 inches then the area would be 20 inches^2(squared)