Chapter 15 Visualising Solid Shapes
Exercise 15.1
Ex 15.1 Class 7 Maths
Question 1.
Identify the nets which can be used to make cubes (Cut out copies of the nets
and try it):
Solution:
Fig. (ii), (iii), (iv) and (vi) can be used to make cubes.
Ex 15.1 Class 7 Maths
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.
Solution:
Ex 15.1 Class 7 Maths
Question 3.
Can this be a net for a die? Explain your answer.
Solution:
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.
Ex 15.1 Class 7 Maths
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).
Solution:
There are three faces in the given net.
Ex 15.1 Class 7 Maths
Question 5.
Match the nets with appropriate solids:
Solution:
(a) (ii)
(b) (iii)
(c) (iv)
(d) (i)
