RD Sharma 2017 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 2017 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 2017 Solutions. All RD Sharma 2017 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.
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| 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 |
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
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