Primary School (English Medium) Class 4 - CBSE Question Bank Solutions for Mathematics

What if a rectangle was made? Discuss.

Think of some other games you play by making circles.

Is any of these a good drawing of a circle?

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

Also draw a circle in your notebook using a pencil.

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

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?