A square can't have a circumference. That's only for circles squares have area, volume, or perimeter.
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circumference = pi*d so it is a linear function. If d is multiplied by x, so is the circumference.
It is used in finding the circumference and area of a circle. Circumference = 2*pi*radius or pi*diameter measured in linear units Area = pi*radius2 measured in square units
They can't have the same value, since area has square units and circumference has linear units. But their number portions can be the same. The circumference and the area of a circle with a radius of 2 are both (4 pi), with the appropriate units.
Circumference is a linear measure and has no volume - just as a straight line has no volume.
There are linear feet, and square feet, but no "linear square feet".