No. They may be of different sizes.
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yes -novanet
If all the angle and side measures are the same, then yes, they're all congruent.
Nope. They can be any shape or size meaning they CAN be congruent.
a regular polygon
Regular * * * * * Equilateral. It is regular only if all its angles are also congruent. A rhombus is NOT a regular polygon, a square is the only regular quadrilateral.