Yes it is a square is a regular quadrilateral because it is not a unknown shape
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That is an interesting reason - but wrong. A square is the only quadrilateral whose sides are all equal and whose angles are all equal. Both sides and angles must be equal for a polygon to be termed regular.
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All squares are quadrilaterals. All quadrilaterals are not squares. There is no square that is not a quadrilateral.
Well, honey, let me break it down for you. All squares are indeed quadrilaterals, but not all quadrilaterals are squares. It's like saying all thumbs are fingers, but not all fingers are thumbs. So, yes, squares are a type of quadrilateral, but don't go thinking every four-sided shape is a square.
squares and rectangles
Squares, parallelograms, rhombuses, and trapezoids are quadrilaterals that are not rectangles.
Well, a trapezoid is a quadrilateral. All regular quadrilaterals have 2 pairs of parallel sides. Ex, squares rectangles and trapezoids