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A compass saw is used to make curved cuts
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.
its a compass of course! that can be used to map out the sun,moon and other types of planets
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.
The first proportional compasses were invented in the mid sixteenth century. Galileo invented a geometric and military compass in Padua in 1597. With his compass it was possible to make all sorts of arithmetical and geometrical calculations, from calculating interest to square and cube roots to drawing polygons and surveying.