When using constructions(bisecting or copying and angle)
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A compass
Area of compass: 3.14*15*15 = 706.5 square mm
to determine direction
the compass of math is used in making arcs and circles. with the use of a compass, a person can draw an axact circle where the points on the circle are equidistant from the center.
A compass is used to construct a perfect circle of 360 degrees.