1. (noun) a closed plane figure bounded by straight sides

• polygon

1. (noun) a closed plane figure bounded by straight sides

• concave polygon
• convex polygon
• decagon
• dodecagon
• heptagon
• hexagon
• isogon
• nonagon
• octagon
• pentagon
• quadrangle
• quadrilateral
• tetragon
• spherical polygon
• triangle
• trigon
• trilateral
• undecagon

1. (noun) a closed plane figure bounded by straight sides

• plane figure
• two-dimensional figure