A quadrilateral is a polygon with four sides and four vertices.
4sides
1 ) they all have 4sides 2 ) they all have 4corners
If you turn a square 45 degrees the Corners get cut off making 4 extra sides. 4sides + 4sides makes 8 sides. this makes an octagon
20cm/4sides = 5cm 5cm*5cm = 25cm^2
Polygon
A quadrilateral is a polygon with four sides and four vertices.
your stupid - Chrissia
A shape with four sides has four vertices and a shape with three sides has three vertices, so a shape with four sides has more vertices than a shape with three sides.
4sides
square
It is a four sided quadrilateral as for example a square
A rhombus (or parallelogram).
1 ) they all have 4sides 2 ) they all have 4corners
If you turn a square 45 degrees the Corners get cut off making 4 extra sides. 4sides + 4sides makes 8 sides. this makes an octagon
4sides
Rhombus