A 4 sided quadrilateral is only a regular polygon when it is in the shape of a square
A quadrilateral is any shape with four sides; angles can be acute or obtuse. A perfect square is the only quadrilateral with only right angles.
It is a square
a square
The polygon could be multiple shapes. The only definite shape it can be is a quadrilateral. The quadrilateral could be a rectangle, square, rhombus, kite, or an irregular quadrilateral.
Because a square is a 4 sided shape.
a square
A square
a quadrilateral
A square.
A quadrilateral shape has 4 sides such as a square, a rectangle, a rhombus, a parallelogram, a kite ... etc
It can be a square or a even a parallelogram! It's just something with 4 sides.