Four sided figures in English can be called square, rectangle, rhombus, or trapezium, but also Quadrilateral (four-sided from latin) and, rarely, Tetragon. Latin also wins out for quarter, quartet, quadruple, and quadrangle (rather than tetrangle). read more
A three dimensional hexagon is can be called a hexagonal prism.This is similar to a cylinder, except on each end, instead of acircle there are hexagons. read more