**3-D Rectangular solid :**

In a **rectangular** **solid** **all** the angles are **right-angled** and have **opposite faces** of an equal** cuboid**. It is also a perfect **rectangular prism**. The term **rectangular** or **rectangular prism** is ambiguous. It is also referred to by the term **rectangular** parallel **quadrilateral** or **orthogonal** parellopiped.

A **square cuboid**, a square box or a right square **prism**, also vaguely called a **square prism**, is a special case of a **cuboid** that has at least two faces squared. Cube squares are a special case of cuboids in which all six faces are squares.

If a cuboid has dimensions A, B and C, its volume is ABC and

its surface area is –

2ab + 2bc + 2ac.

The length of the space diagonal is –

d = √( a^{2 } +b^{2 } + c^{2} )

Cuboid shapes are just like boxes, cupboards, rooms, buildings, etc. Cuboids are among solids that are belongs to 3-D space. The shape is quite versatile in being able to contain many small cubes, e.g. Chinese cubes in a box, small boxes in a large box, a cupboard in a room and rooms in a building.