CARTS AND WHEELS
You must have seen many such round things around you. List some more in your notebook.
Have you ever gone to a bangle shop?
Which thing makes the smallest circle?
Which thing makes the biggest circle?
Children are playing some games ............…
Do you play these games?
Which song do you sing whne you play these?
Play these games in your school
Why do we make a circle in each of these games ?
What if a rectangle was made? Discuss.
Naina, Chippu and Ariba want to play a game. They want to make a big circle on the ground. But they cannot make it by tracing. So, Ariba tries to draw a circle with a stick.
Chippu and Naina – It does not look like a circle at all.
Ariba – OK! Why don't both of you try?
Chippu and Naina both make circles on the ground.
The purpose of this exercise is to give opportunities to each child to make freehand circles. They can also make circles on the ground with a stick. They can compare different drawings to get an intuitive sense of the shape of a circle.
Ariba decided to use nails and a thread to make a circle on the ground. She took a thin rope and tied nails on both ends of the rope. Then she made a circle with the help of her friend. Look at the picture and see how they are making the circle.
The purpose of this exercise is to help children make different circles, measure the lengths of their radii and see how the size of a circle changes with its radius
Now see what your friends have drawn. Discuss the length of the radius they measured. Is it the same as yours?
Guess which circle has the longer radius._______
Measure the radius of both the circles using a ruler.
Write the length of their radius.
Are all the wheels of a bicycle or a bullock cart of the same radius? ___________
Children need a lot of interesting exercises of making and measuring the radius of circles of different sizes. They can also make wheels and carts.
Daljeet has made these designs using a compass.
His sister came and started making more designs with him.
Do you want to make such designs? To make such designs you will need to use a compass.
Have you seen a compass before? How will you use this to make a circle?
This mark is the centre of your circle.
Now you can make your own designs like Daljeet had made. How many did you make?
Guess how this design has been made. Use a compass to make a similar one in the box.
Encourage children to explore their own designs with a compass. This will also give them more practice in drawing circles with a compass.
Naina was making a circle.
Ravi asked her for an eraser. She kept her compass and gave him the eraser. Then she started again to complete her circle. But she got this.
Can a circle have more than one centre?
Another day Naina was using a compass to make circle. But it came out like this.
Sadiq and Sameena want to make circles for themselves.
Then they cut their circle.
She folded her circle into half.
Then she folded it again like this.
She opened the folded circle.
We can also make the design on page 88 like this. How did you do it?
Can you balance a plate on your finger?
You also try to balance a plate or a round lid on your finger. Where does it balance?
Zakir, Appu, Naina and Guddo were getting bored. It was raining. So they could not go out to play.
Suddenly Appu said – Let's each make a top.
They took a piece of cardboard traced a circle on it. Then they made a hole and put a matchstick in it.
Now everybody was excited to spin their tops which looked like this.
You also make your own top and play this game.