In geometry, a cuboid is a solid figure bounded by six rectangular faces. It can also be called a rectangular parallelepiped or rectangular prism. All angles of a cuboid are right angles and opposite faces of a cuboid are equal.
The square prism is a special case of the cuboid in which at least two faces are squares. The cube is a special case of the square prism in which all faces are squares.
If the dimensions of a cuboid are a, b and c, then its volume is abc and its surface area is 2ab + 2bc + 2ac.
A rectangular frame leans on a circular basis by means of a column.
Between the collimator and the telescope the prism is placed, covered by a cylindrical shell with two holes.
Between the two instruments we have the prism covered by a cylindrical container with two windows in correspondence of the collimator and of the telescope.
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