Rd Sharma 2020 2021 Solutions for Class 7 Maths 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 Maths Visualising Solid Shapes Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Rd Sharma 2020 2021 Book of Class 7 Maths Chapter 19 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Rd Sharma 2020 2021 Solutions. All Rd Sharma 2020 2021 Solutions for class Class 7 Maths 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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