Eratosthenes1
Galileo--compass1
Geometry--Famous problems1
Hippasus1
Mathematics--Ancient1
Mesolabe1
Metapontum1
Pierre Wantzel1
Polyhedra1
Pythagoreans1
Quadrature of Polygons1
Topology--History1
compass and straightedge constructions1
early history of pi1
heptagon1
irrational--transcendental numbers1
nine impossibiity theorems1
nonagon1
regular polygons1