Points to Remember: Plane shapes having two measurements like length and breadth are called two dimensional shapes (2-D).
Solid shapes having three measurements like length, breadth and height or depth are called three dimensional shapes (3-D). In polyhedron relationship between no. of faces (F), vertices (V) and edges (E) is F + V – E = 2 It is also called Euler’s Formula. Prism : A polyhedron whose base and top are congruent polygon and whose other faces are parallelogram. Pyramid : A polyhedron whose base is a polygon and whose lateral faces are triangles with a common vertex. Practice Worksheet 1. Write down the number of faces of each of the following figures: (i) Cuboid (ii) Cube (iii) Triangular prism (iv) Square pyramid (v) Tetrahedron 2. Write down the number of edges of each of the following figures: (i) Tetrahedron (ii) Rectangular pyramid (iii) Cube (iv) Triangular prism 3. Write down the number of vertices of each of the following figures: (i) Cuboid (ii) Square pyramid (iii) Tetrahedron (iv) Triangular prism 4. Fill in the blanks: (i) A cube has …………….. vertices, …………….. edges and …………….. faces. (ii) The point at which three faces of a figure meet is known as its …………….. . (iii) A cuboid is also known as a rectangular …………….. . (iv) A triangular pyramid is called a …………….. . Answers: 1. (i) 6 (ii) 6 (iii) 5 (iv) 5 (v) 4 2. (i) 6 (ii) 8 (iii) 12 (iv) 9 3. (i) 8 (ii) 5 (iii) 4 (iv) 6 4. (i) 8, 12, 6 (ii) vertex (iii) prism (iv) tetrahedron
3 Comments
satish kumar
5/7/2014 04:40:11 am
very good
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Faiz
7/2/2017 07:08:53 pm
Very useful
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Pranav
31/5/2017 12:31:55 pm
Very useful information.
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