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 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
In plane geometry, a shape with four sides, two of which are parallel and have the same length, cannot have a reflex angle.
A square has four equal sides and four equal angles * * * * * A square is a specific example. More generally, the shape is a REGULAR POLYGON.
Shapes with 4 sides are called quadrilaterals. If all the sides of the shape have the same length, then there are two options for specific quadrilaterals. These are squares or rhombuses. If the pairs of sides are not the same length as each other, then there are two alternate options for the shape. These are rectangles and parallelograms.
Parrallelogram