Rectangular is an adjective and so there is no noun in the question.
To put it another way, a rectangular what?
It is usually a plane shape that forms a boundary of the figure..It is usually a plane shape that forms a boundary of the figure..It is usually a plane shape that forms a boundary of the figure..It is usually a plane shape that forms a boundary of the figure..
There are many plane shapes comprising 4 squares and 2 rectangles but there is no such 3-dimensional shape.
A flat shape.
cube
a face
It is usually a plane shape that forms a boundary of the figure..It is usually a plane shape that forms a boundary of the figure..It is usually a plane shape that forms a boundary of the figure..It is usually a plane shape that forms a boundary of the figure..
A three sided closed plane figure (shape) is a triangle.
A polygon is a 2-dimensional shape with 3 or more sidesa closed plane figure with three or more sides that are straight
There are many plane shapes comprising 4 squares and 2 rectangles but there is no such 3-dimensional shape.
A flat shape.
A plane figure is a geometric shape. A plane figure is known as a 2-dimensional shape because it has only length and breadth. The thickness of the plane figure is zero. Any shape that is drawn on paper is known as a plane figure. In the real world, there is no object that represents a plane figure.
cube
Such at figure - as described - could not be made as a solid geometric shape.
A twelve-sided plane figure is called a dodecagon.
a solid figure with five plane surfaces
a face
cuboid, rectangular prism