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.
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A compass
A protractor, a straight edge and a compass
A compass is used to construct a perfect circle of 360 degrees.
Scale, protractor,compass,divider,set square
compass and straightedge.