Square and a rhombus
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A rhombus is not a regular quadrilateral (unless it is a square) because being regular requires all sides AND all angles to be equal. So there is only one type of a regular quadrilateral - a square. It may have other names, certainly so in other languages.
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It is a square
A square is a regular 4 sided quadrilateral
A quadrilateral and a polyhedron respectively
Take any two points on its perimeter. Join them together and, if required, cut along that line. You now have non-regular quadrilateral that is divided.Take any two points on its perimeter. Join them together and, if required, cut along that line. You now have non-regular quadrilateral that is divided.Take any two points on its perimeter. Join them together and, if required, cut along that line. You now have non-regular quadrilateral that is divided.Take any two points on its perimeter. Join them together and, if required, cut along that line. You now have non-regular quadrilateral that is divided.
which type of quadrilateral is never a regular polygon