Chapter 1 Shapes Around Us
NCERT Class 4 Maths Mela Chapter 1 Shapes Around Us
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NNCERT Class 4 Maths Mela Chapter 1 Shapes Around Us
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NCERT Class 4 Maths Mela Chapter 1 Shapes Around Us
Solutions
NCERT Textbook Page 1
Try to make a model of the buildings shown here using blocks
Question 1.
What parts of the building have you shown in your model
(for example, roof, pillars, base, etc.)?
Answer : I have shown the following parts:
Base
Pillars
Main arch/opening
Top portion
Question 2.
Why did you select these parts?
Answer: I selected these parts because they are the main parts that show the shape and structure of the building.
Question 3.
What shapes will model these parts well?______________
Answer: Cubes, cuboid and cylinders.
Question 4.
How is your model similar to the picture of the real building? Answer: It has the same basic shape and important parts like the pillars and the arch.
Question 5.
How is it different from the real building? ______________
Answer: It is smaller, simpler and made with blocks, not real materials.
Discussion: What would happen if you removed one piece of your model?
• Would the model still look like the original building?
Answer:
If an important piece is removed:
- The model may lose its shape.
- It may no longer look like the original building.
- It may become weak or fall down.
• In what ways could you make the model even better?
Answer:
I can make the model better by adding more details, colours and decorations so that it looks more like the real building.
NCERT Textbook Page 2
Q 1. Do you think it looks like the Qutub Minar?
Answer: Yes, it looks like the Qutub Minar because it is tall, narrow and has a tower-like shape.
Q 2. What shape would you use if you made a model of the Qutub Minar? Why?
Answer: A cylinder, because the Qutub Minar is tall and round like a cylinder.
Q 3. How many such shapes will you use? ...........
Answer: 5 cylinders.
2. Use the nets given at the end of the book to make the models shown below.
Answer:
3. Now try to make the above shapes using straws and plasticine/
thread and fill in the table.
Answer:
Identify any relationship that you may find between the number of
faces (F), edges (E), and corners (V). Calculate F+V–E in each case.
What do you notice?
NCERT Textbook Page 5
Let Us Observe
Question 1.
Take a die. Look at the face that has number 1. The face numbered 6 is opposite to the face numbered 1.
What is the face opposite to the
(a) face numbered 2?
(b) face numbered 3?
(c) face numbered 4?
Solution:
(a) A standard dice is designed so that the numbers on opposite faces always add up to 7.
Since, 7 – 2 = 5, the opposite of face numbered 2 is face numbered 5.
(b) Since, 7 – 3 = 4, the opposite of face numbered 3 is face numbered 4.
(c) Since, 7 – 4 = 3, the opposite of face numbered 4 is face numbered 3.
Question 2.
(a) Which faces have common edges with the face numbered 1?
(b) Which face has no common edge with face numbered 1?
Solution:
(a) Each face has common edges with all the other faces except the face opposite of it. So, the faces numbered 2, 3, 4, and 5 have common edges with the face numbered 1.
(b) The face opposite to the face numbered 1 is the face numbered 6. Therefore, face numbered 6 has no common edges with the face numbered 1.
3. Look at three different views of the same cube.
a) What colour is the face that is opposite to the red
face? ............................
Answer : Purple.
b) What colour is the face that is opposite to the yellow
face? .....................................
Answer : Green.
Follow these instructions for the shapes along the border.
1. Colour all shapes with a rectangular face in red.
2. Draw a smiley on shapes with a triangular face.
3. Draw a star on shapes with a curved face.
4. Colour all shapes with no corner in blue.
5. Circle the shapes that have the same opposite faces.
Solution:
Do it yourself.
In which circle did you write triangular prism and rectangular pyramid?
Solution:
In the region common to both circles A and B.
Let us sort shapes in another way.
Using circles like those on the previous page, can you sort shapes into the categories “Shapes with curved faces” and “Shapes with flat faces”?
Solution:
Write the names of 3D shapes in the correct places.
Is a cube also a prism?
What is the difference between a prism and a pyramid? Discuss.
1. Make a sphere-like shape with paper strips.
Craft
Prisms
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