Crossword Clue:

a four sided polygon

Answer	Crossword Clue
HERM	Four-sided monument named for a Greek god
TETRA	Aquarium fish with a name that derives from the Greek for "four-sided wing"
OCTAGON	Eight-sided polygon.

TETRAGONAL	Four-sided.
OBELISK	Four-sided pillar
RECT	Four-sided fig.
TRAPEZOID	Four-sided shape
RHOMBUS	Four-sided figure
RECTANGLE	Four-sided figure
SQS	Four-sided figs.
FOIL	Four-sided blade

RHOMB	Four-sided figure
RHOMBI	Four-sided figures
RECTS	Four-sided figs.
OBLONG	Four-sided figure
TRAPEZOIDS	Certain four-sided figures.
TRAPEZIA	Certain four-sided figures
OBELISK	Four-sided monolithic pillar.
QUAD	Four-sided campus space

RHOMB	Oblique-angled, four-sided figure
MANSARDROOF	Four-sided, double-sloped housetop
QUAD	Four-sided figure, for short
LUGGER	Vessel with four-sided sail.
TRAPEZOID	Four-sided figure with two parallel sides.