The word quadrilateral means "four sides".
It refers to a shape that's on a flat surface.
So a quadrilateral is any shape that has 4 sides
Example: square. rectangle
Some people like to say that a quadrilateral has four points.
That's right but it's better to say that it has four sides.
Note that a four-sided solid is called a tetrahedron.
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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:
A rectangle
It is a parallelogram or an isoangular quadrilateral.