i believe it's a quinterron. i could be wrong, - YES you are wrong a quinterron has 15 sides. It is a plain simple SQUARE.
A four-sided shape with only 2 sides the same length is called a rhombus.
A kite
A kite or arrowhead.
A shape with opposite sides parallel and of the same length and four right angles is a rectangle.
The shape is a square.
a rhombus
A square
parrallelogram
Parrallelogram
A four sided figure with all sides the same length and opposite sides parallel.
In plane geometry, a shape with four sides, two of which are parallel and have the same length, cannot have a reflex angle.
No shape has four equal sides and four different angles - either there are two pairs of equal angles, or all four angles are the same; or all sides are not the same length.