It is an 8 sided polygon - a plane shape bounded by 8 straight lines of equal length. The angles need not be of the same measure.
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No, there is no need for it to be equilateral.
Not necessarily. A rhombus is an equilateral quadrilateral but does not have a line of symmetry. An irregular octagon does not, either.
No, they cannot.
an octagon * * * * * An octagon need not have equal sides. For that it would have to be an equilateral octagon (though not necessarily regular).
No but they will make a hexagon