Polygons
Either a square or rectangle fit this description.
A sextet is a group of 6 things. I think you are referring to Hexagon, which has 6 sides.
hexagon,sides of dice,and strings on a guitar
A square belongs to the group of 4 sided quadrilaterals
a group of soldiers that stood in a square to fight?
Abelian meaning commutative. If the symmetry group of a square is commutative then it's an abelian group or else it's not.
Square dancers.
Kentech Group Hexagon House Little Island Cork Ireland
Hexagon. Although circles would represent a more accurate omnidirectional coverage, when we want to group circles together, they overlap one another. Hexagon doesn't and still has a somewhat 'circular' shape.
Hexagon. Although circles would represent a more accurate omnidirectional coverage, when we want to group circles together, they overlap one another. Hexagon doesn't and still has a somewhat 'circular' shape.Read more: What_geometric_shape_is_used_in_cellular_system_design
A quadrilateral or tetragon.
Actually the trapezium is a shape. Trapezoid is the general group term for shapes of it's general shape. It has only two parallel sides.