The straightedge and the compass. The name is due to the fact that connecting points with segments, prolonging segments and drawing circles with a given center and a given radius are the basic geometric constructions described in the first three Euclidean postulates.
Euclidean Tools
See also
Compass, Euclidean, Geometric Construction, StraightedgeThis entry contributed by Margherita Barile
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Cite this as:
Barile, Margherita. "Euclidean Tools." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/EuclideanTools.html