It is its surface area
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"Space" is usually understood to be a 3-dimensional "volume", and in that sense, there is no 'space' inside a circle. A circle has "area", equal to (pi) times the square of the circle's radius.
the amount of space inside a circle
The area of a circle is the amount of space inside the circle. The area of a circle is calculated by multiplying pi(3.14159) by the radius squared.
Pie x radius squared You must know the radius.
It is its surface area.