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**Introduction**

**Cuboid --a cuboid is a solid bounded by six rectangular plane regions.**

**Faces Fig. 16.1 is made of six rectangular plane regions namely ABCDEFGH CGFB AEFB and CDHG. These six rectangular plane regions are six faces of the cuboid shown in Fig. 16. 1.**

**Edges any two adjacent faces of a cuboid meet in a line segment which is called an edge of the cuboid.**

**Vertex for any two edges that meet at an end-point there is a third edge that also meets them at that end-point. This point of intersection of three edges of a cuboid is called a vertex of the cuboid.**

**Base and lateral faces any face of a cuboid may be called the base of the cuboid. In that case the faces which meet the base are called the lateral faces of the cuboid.**

**Solid cuboid a solid cuboid or a cuboid or a cuboidal region in the part of space bounded by the xis faces of a cuboid.**

**Cube a cuboid whose length breadth and height are all equal is called a cube.**

**Solid cube a solid cube is the part of the space enclosed by the six faces of the cube.**

**Axis the line segment joining the centres of two bases is called the axis of the cylinder.**