In general, a diamond shape is neither a square nor a regular polygon. Only in an extreme form is it a square and therefore a regular polygon.
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It is a regular 10 sided decagon
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Pentagon A+
A square, or an equilateral triangle A regular polygon * * * * * Not quite. These are some shapes but here are others. The correct answer is EQUILATERAL. A rhombus, for example, does have all equal sides but, because it does not have equal angles, is not a regular polygon.
A regular polygon