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Question 13 Marks
Complete the following table and verify Euler’s formula in each case.
 
 
Faces $(F)$
$6$
$4$
$9$
$7$
Edges $(E)$
$12$
$6$
$16$
$15$
Vertex $(V)$
$8$
$4$
$9$
$10$
Answer
 
I
II
III
IV
Faces $(F)$
$6$
$4$
$9$
$7$
Edges $(E)$
$12$
$6$
$16$
$15$
Vertices $(V)$
$8$
$4$
$9$
$10$
Euler's formula $( F - E + V)$
$6 - 12 + 8 = 2$
$4 - 6 + 4 = 2$
$9 - 16 + 9 = 2$
$7 - 15 + 10 = 2$
Hence Euler's formula is verified for these figures.
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Question 23 Marks
$(a)$ $(I)$
$(b)$ $(II)$
$(c)$ $(III)$
$(d)$ $(IV)$
Answer
Here,
$(a)$ $(II)$
$(b)$ $(III)$
$(c)$ $(IV)$
$(d)$ $(I)$
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Question 33 Marks
Identify the nets which can be used to make cubes (cut-out the nets and try it):
Image
Answer
(ii), (iv), (vi)
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