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E:\Working\Focus_Learning\Math_Genius_2_(09-10-2023)\Open_Files\Chap_08
\ 17-Nov-2023 Bharat Arora Proof-6 Reader’s Sign _______________________ Date __________
Learning by Doing
Objective: Wrapping and decorating a gift box.
Materials required:
An empty shoebox or any other cubical/cuboidal box, a sheet of gift wrapping paper,
few stars, colourful ribbon/paper strip, some decorating stones and glue.
Procedure:
First, cover the box with a wrapping paper.
The part of the box that we see or touch is its surface or face.
Paste a star on each face of the box.
How many stars have you used? ________
The line where two faces of the box meet is called the edge.
Glue the colourful strips and put it along all its edges.
Are the lengths of all strips same? ________
How many strips have you used in all? ________
The meeting point of the edges is called corner or vertex. (The
plural of vertex is vertices.) Fix a decorating stone on each of
the vertices.
How many decorating stones have you used in all? ________
Wow! Your gift box is so beautiful.
Thus, you observe that a cuboid/cube has ________ faces,
________ edges and ________ vertices.
Brain Sizzlers
1. How many rectangles can you make by joining the dots given here?
[Hint: Square is also a type of rectangle.]
2. Observe the pattern and find the missing number.
4 3 5 4 6 5
10 17 ____
2 3 4
Mathematics-2 151
