Types of solid
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A solid has three dimensions,
A solid has three dimensions, the length, breadth and thickness or height. A solid may be represented
by orthographic views, the nuber of which depends on the type of solid and its orientation with
respect to the planes of projection. solids are classified into two major groups. (i) Polyhedra, and
(ii) Solids of revolution
6.1:1 Polyhedra
A polyhedra is defmed as a solid bounded by plane surfaces called faces. They are :
(i) Regular polyhedra (ii) Prisms and (i~i) Pyramids.
6.1.2 Regular Polyhedra
A polyhedron is said to be regular if its surfaces are regular polygons. The following are some of
the regular plolyhedra.
(a) Tetrahedron: It consists of four equal faces, each one being a equilateral triangle.
(b) . 'Hexa hedron(cube): It consists of six equal faces, each a square.
(c) Octahedron: It thas eight equal faces, each an equilateral triangle.
(d) Dodecahedron: It has twelve regular and equal pentagonal faces.
(e) Icosahedron: It has twenty equal, equilateral triangular faces.
6.2 Prisms
A prism is a polyhedron having two equal ends called the bases pralle I to each other. The two
bases are joined by faces, which are rectangular in shape. The imaginary line passing through the
centres of the bases is called the axis of the prism.
A prism is named after the shape of its base. For example, a prism with square base is called a
square prism, the one with a pentagonal base is called a pentagonal prism,
6.3 Pyramids
A pyramid is a polyhedron having one base, with a number of isosceles triangular faces, meeting at
a point called the apex. The imaginary line passing through the centre of the base and the apex is
called the axis of the pyramid.
The pyromid is named after the shape of the base. Thus, a square pyramid has a square base
and pentagonal pyramid has pentagonal base
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by orthographic views, the nuber of which depends on the type of solid and its orientation with
respect to the planes of projection. solids are classified into two major groups. (i) Polyhedra, and
(ii) Solids of revolution
6.1:1 Polyhedra
A polyhedra is defmed as a solid bounded by plane surfaces called faces. They are :
(i) Regular polyhedra (ii) Prisms and (i~i) Pyramids.
6.1.2 Regular Polyhedra
A polyhedron is said to be regular if its surfaces are regular polygons. The following are some of
the regular plolyhedra.
(a) Tetrahedron: It consists of four equal faces, each one being a equilateral triangle.
(b) . 'Hexa hedron(cube): It consists of six equal faces, each a square.
(c) Octahedron: It thas eight equal faces, each an equilateral triangle.
(d) Dodecahedron: It has twelve regular and equal pentagonal faces.
(e) Icosahedron: It has twenty equal, equilateral triangular faces.
6.2 Prisms
A prism is a polyhedron having two equal ends called the bases pralle I to each other. The two
bases are joined by faces, which are rectangular in shape. The imaginary line passing through the
centres of the bases is called the axis of the prism.
A prism is named after the shape of its base. For example, a prism with square base is called a
square prism, the one with a pentagonal base is called a pentagonal prism,
6.3 Pyramids
A pyramid is a polyhedron having one base, with a number of isosceles triangular faces, meeting at
a point called the apex. The imaginary line passing through the centre of the base and the apex is
called the axis of the pyramid.
The pyromid is named after the shape of the base. Thus, a square pyramid has a square base
and pentagonal pyramid has pentagonal base
Mail id:- [email protected]
Mobile no. 9685277872 (whatsapp )
Others my mobile game on play store
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