A compass is used to make a perfect circle.
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An azimuth circle is a device used for measuring azimuths, a graduated circle on a sight, gun carriage, searchlight, etc.
A device to make work easier is a machine, such as a lever.
A compass is used to construct a perfect circle of 360 degrees.
Somebody named Lui Hui used 372 sides to make a circle
I know one of them is a circle