Four sided polygons
In the first figure the quadrilateral has no sides the same size or angles the same size.
A square is a quadrilateral (four sided figure)and has all its sides the same size and all its angles right angles (90 degrees).
A rectangle is a quadrilateral that has all right angles but the sides that are next to each other (adjacent sides) are different lengths.
A parallelogram is a quadrilateral that has opposite sides parallel.
A rhomboid is a quadrilateral with two sides parallel, two sides not.
A square is a quadrilateral (four sided figure)and has all its sides the same size and all its angles right angles (90 degrees).
A rectangle is a quadrilateral that has all right angles but the sides that are next to each other (adjacent sides) are different lengths.
A parallelogram is a quadrilateral that has opposite sides parallel.
A rhomboid is a quadrilateral with two sides parallel, two sides not.
Geometry: using only compasses and straightedge