Define the following:
(i) Polyhedron    (ii) Prism     (iii) Pyramid

(i) Polyhedron: A solid shapes bounded by polygons is called a polyhedron. For example, cube, cuboid, etc.
(ii) Prism: A prism is a solid, whose faces are parallelograms and whose ends (or bases) are congruent parallel rectilinear figures.
(iii) Pyramid: A pyramid is a polyhedron whose base is a polygon of any number of sides and whose other faces are triangles with a common vertex.

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According to the Euler’s formula, we have F + V – E =  ___________.

2

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Which of the following solids are not polyhedrons?


(i) A cylinder is not a polyhedron.
(ii) A cuboid is a polyhedron.
(iii) A cube is a polyhedron.
(iv) A cone is not a polyhedron.
(v) A sphere is not a polyhedron.
(vi) A pyramid is a polyhedron.

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Following solids are made by joining cubes. Draw their different views.


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A cuboid has _______ faces, _______ edges and _______ vertices.

6

,

12

,

8

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