RD Sharma (2014) Solutions for Class 7 Math Chapter 19 Visualising Solid Shapes are provided here with simple step-by-step explanations. These solutions for Visualising Solid Shapes are extremely popular among class 7 students for Math Visualising Solid Shapes Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the RD Sharma (2014) Book of class 7 Math Chapter 19 are provided here for you for free. You will also love the ad-free experience on Meritnation’s RD Sharma (2014) Solutions. All RD Sharma (2014) Solutions for class 7 Math are prepared by experts and are 100% accurate.

Page No 19.3:

Question 1:

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.

Page No 19.3:

Question 2:

Give three examples from our daily life which are in the form of (i) a cone (ii) a sphere (iii) a cuboid (iv) a cylinder (v) a pyramid.

Answer:

 Examples of

(i) Cone: Ice-cream cone, clown cap, rocket
(ii) Sphere: Football, a round apple, an orange
(iii) Cuboid: book, brick, duster
(iv) Cylinder: circular pipe, glass, circular pole
(v) Christmas decorations, cheese and patio umbrellas.



Page No 19.5:

Question 1:

Match the following nets with appropriate solids:

Answer:

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



Page No 19.6:

Question 2:

Identify the nets which can be used to make cubes (cut-out the nets and try it):

Answer:

Only (ii), (iv) and (vi) form a cube.

Page No 19.6:

Question 3:

Can the following be a net for a die? Explain your answer.

Answer:

Since, in a die, the sum of the number of opposite faces of a die is 7. In the given figure, it is not possible to get the sum as 7. Hence the given net is not suitable for a die.

Page No 19.6:

Question 4:

Out of the following four nets there are two correct nets to make a tetrahedron. Identify them.

Answer:

For making a tetrahedron, only (i) and (iii) are suitable nets.

Page No 19.6:

Question 5:

Here is an incomplete net for making a cube. Complete it in atleast two different ways.

Answer:


The complete nets for making a cube are
Images



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