a regular polygon
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a polygon with all sides the same length and all angles the same measure is called?
That is called a regular polygon.
Yes, a parallelogram is an irregular polygon because its sides and angles are not all the same. For a shape to be a regular polygon it must be equangular (all angles are the same) and equilateral (all sides have the same length).
A polygon with all sides and angles the same is called a "regular polygon."
A regular hexagon is a polygon with six sides where all six angles have the same measurement. (And all six sides have the same length.) If the angles of a hexagon do not all have the same measurement, or if the sides are not all of the same length, then the hexagon is irregular.