Chapter 8: Carts and Wheels

Q11Written answer

Question: 11

(a) Is any of these a good drawing of a circle?

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Answer: No, none of these is good for drawing a circle.

(b) Can you draw a circle on the floor with chalk? Try.

Answer: Yes, by using chalk I can draw a circle on the floor.

NCERT Solutions Mathematics Class 4 Chapter 8 - 4

(c) Also, draw a circle in your notebook using a pencil.

Answer: The circle drawn with a pencil is shown below.

NCERT Solutions Mathematics Class 4 Chapter 8 - 5

(d) Look at the circles drawn by your friends. Who has drawn the best circle?

Answer: Circles drawn by my friends are given below.

NCERT Solutions Mathematics Class 4 Chapter 8 - 6

The circle drawn by Soni is the best circle.

NCERT book Page No: 85-86

Making a Circle with a Rope

Q12Written answer

Question: 12

(a) Do the activity in small groups. Each group should take a rope of a different length. See the circles made by different groups.

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NCERT Solutions Mathematics Class 4 Chapter 8 - 7

Circle drawn by Rani’s group is the smallest circle.

(b) How long was their rope?

Group	Length of their rope
Rani’s Group	2 metre
Molu’s Group	5 metre
Rahul’s Group	8 metre

(c) Does a longer rope make a bigger circle? Why is it so?

Answer: Yes, it can make a bigger circle. This is because a longer rope acts as a bigger radius. Hence, the circle made by the longest rope is the biggest circle.

NCERT Solutions Mathematics Class 4 Chapter 8 - 8

(d) What was the radius of the smallest circle?

Answer: The smallest circle radius was 2 metres.

Q13Written answer

Question: 13

Draw the radius of this bangle using a ruler. Measure the length of the radius.

NCERT Solutions Mathematics Class 4 Chapter 8 - 9

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NCERT Solutions Mathematics Class 4 Chapter 8 - 10

The radius of this bangle is 2 cm.

Q14Written answer

Question: 14

Now see what your friends have drawn. Discuss the length of the radius they measured. Is it the same as yours?

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Answer: The radius drawn by all the friends is the same.

Q15Written answer

Question: 15

Draw the radius of these circles. Guess which circle has the longer radius.

NCERT Solutions Mathematics Class 4 Chapter 8 - 11

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NCERT Solutions Mathematics Class 4 Chapter 8 - 12

Here, the radius of the bigger circle is longer.

Q16Written answer

Question: 16

Measure the radius of both circles using a ruler. Write the length of their radius.

(a) Radius of the green circle

(b) Radius of the blue circle

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(a) Radius of the green circle is 1 cm.

(b) Radius of the blue circle is 1.8 cm.

Find out

Q17Written answer

Question: 17

Measure the radius of the wheels of a bicycle or a bullock cart. You can use a thread or a measuring tape.

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Answer: The radius of the wheels of a bicycle is 14 inches. The radius of the wheel of a bullock cart is 22 inches.

Q18Written answer

Question: 18

Are all the wheels of a bicycle or a bullock cart of the same radius?

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Answer: Yes, they are of the same radius.

Q19Written answer

Question: 19

Have you seen a tractor or a road roller?

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Answer: Yes, I have seen both.

Q20Written answer

Question: 20

Which is the biggest wheel you have ever seen?

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Answer: The biggest wheel I have ever seen is the wheel of a merry-go-round.

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