A compass
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To draw circles you need to use a compass
A compass is a geometric tool used to draw circles.
A drawing compass - often referred to as a pair of compasses.
Most of the time, a tool called a "compass" is used to draw perfect circles. This compass is not to be mistaken with a directional compass.
Pi is used anytime there is a circular (as opposed to linear) geometry involved. Examples include circles, cylinders, spheres, and other cruves.