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Chapter 15 Visualising Solid Shapes Ex 15.1 Solutions

Question - 1 : - Identify the nets which can be used to make cubes (Cut out copies of the nets and try it):

Answer - 1 : - Fig. (ii), (iii), (iv) and (vi) can be used to make cubes.

Question - 2 : -
Dice are cubes with dots on each face. Opposite faces of a die always have a total of seven dots on them.
Here are two nets to make dice (cubes); the number inserted in each square indicate the number of dots in that box.
 
Insert suitable number in the blanks, remembering that the number on the opposite faces should total to 7.

Answer - 2 : -


Question - 3 : - Can this be a net for a die? Explain your answer.

Answer - 3 : -

If one pair of opposite faces will have 1 and 4 on them, then their total does not come 7.
If we take 3 and 6 on the opposite faces of the die, then the total does not come 7.
Hence, this cannot be for a die.

Question - 4 : - Here is an incomplete net for making a cube. Complete it in atleast two different ways. Remember that a cube has six faces. How many are there in the net here? (Give two separate diagrams. If you like, you may use a squared sheet for easy manipulation).

Answer - 4 : - There are three faces in the given net.

Question - 5 : - Match the nets with appropriate solids:

Answer - 5 : -

(a) (ii)
(b) (iii)
(c) (iv)
(d) (i)

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