a base is the the number that is with the exponent
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You cannot know that. It could be base 10.
You will need to know the height before you can calculate the base form the area.
If you know the total area and the height are known, you can find the base. Area=(1/2)(base)(height), so if you know the height and area you can solve for the base. So now, Base=Area/(1/2)(height)
in a triangle double area and divide by base in a rectangle divide area by base
That looks as if it already IS in base ten. If it isn't, you should know (and specify, if you ask) the base, before you can convert it.