No, there is no need for it to be equilateral.
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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
Octagonal An octagon has eight sides and eight angles, and is a two-dimensional shape. In an equilateral octagon, each side has a degree measure of 135.