Primary School (English Medium) इयत्ता ४ - CBSE Question Bank Solutions

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

Which group made the smallest circle?

How long was their rope?

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

What was the radius of the smallest circle?

Draw the radius of this bangle using a ruler.

Measure the length of the radius.

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

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

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

1. Radius of the green circle ______
2. Radius of the blue circle ______

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

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

Have you seen a tractor or a road roller?

Which is the biggest wheel you have ever seen?

Are all wheels of a tractor or road roller of the same radius?

Lali and Kali are tied to a pole with ropes. Kali has a longer rope. Who can look for more grass to eat?

Have you seen a compass before? How will you use this to make a circle?

- Open your compass.

- Press the tip of the compass on the paper. Hold the compass from the top.

- Without moving the tip, try to move the pencil around.

- Do you get a circle?

Is this circle better than the one you made earlier without a compass?

Draw the radius of this circle and measure it.

Now you can make your own designs like Daljeet had made. How many did you make?

Guess how this design has made. Use a compass to make similar one in the box.

Why did Naina get such a drawing? Discuss.