No. The sides are not all the same length.
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its a regular quadrilateral * * * * * No it is NOT! The sides of a rectangle, in general, are not all the same length and, therefore, it is not a regular polygon.
Rectangle or a square
A quadrilateral is a polygon with four sides. A rectangle is a quadrilateral
A rectangle is always a quadrilateral and a parallelogram.
So sometimes yes A quadrilateral is a polygon with 4 sides. A rectangle is a parallelogram with 4 right angles. A quadrilateral is sometimes a rectangle. Here is an example of a quadrilateral that is not a rectangle: