CBSE Class 4 Mathematics NCERT Solutions: Unit 8 Carts and Wheels

We see many round objects in our daily lives. Here is a list of some common round things:

1. Bangles
2. Bread
3. Glass
4. Tawa (a flat griddle)
5. Pressure cooker lid
6. Bowl
7. Wheelchair wheel
8. Coins
9. Drum
10. Tyre
11. Cup
12. Plate
13. Moon
14. Sun
15. Globe
16. Ball

1. Yes, I have visited a bangle shop with my mother.
2. The smallest bangle in the shop would be closest to my size.
3. I can make a bangle by taking a piece of wire and bending it into a circle. If I wrap the wire around a pipe or my wrist to shape it, I can create a bangle. My teacher would likely not be able to wear this bangle because it would be made to my size, which is probably smaller than her wrist size.

Besides a bangle, many other round objects can be used to trace a circle. Some examples include:

• Coins (like a rupee coin or a fifty paise coin)
• The rim of a glass or cup
• A bowl
• A plate
• A CD or DVD
• A tyre of a vehicle

To trace a circle, place the chosen object firmly on the paper or ground and carefully draw along its edge with a pencil or chalk. For instance, placing a coin on the notebook and tracing its edge will create a small, neat circle. Similarly, using the rim of a glass will create a larger circle.

Which thing makes the smallest circle? The coin makes the smallest circle among the common objects used for tracing.

Which thing makes the biggest circle? The glass (or a larger bowl/plate) can make a bigger circle compared to a coin or bangle.

1. Yes, I play games that often involve a circle.
2. When playing games like 'chorus' or 'passing the parcel', we often sing various rhymes or songs. One popular rhyme is "Ringa Ringa Roses" or simple counting songs. A common song might be "Rain, rain go away, we children want to play."
3. We make a circle in these games because a circle has no corners. This ensures that everyone stands at an equal distance from each other and from the center (if there is one), giving each player a fair chance. It creates a smooth flow for activities like passing an object or moving around.
4. If a rectangle was made instead of a circle for a game, it would create problems. The corners of the rectangle would be closer to the center than the middle of the sides. This would mean players standing at different positions would have unequal distances to cover or unequal opportunities. For example, in a game like cricket, if the boundary was a rectangle, the distance from the batsman to the boundary would vary, making the game unfair.

Besides the games mentioned, here are some other games that are often played by making circles:

• Musical Chair Race: Players walk around chairs arranged in a circle and try to grab one when the music stops.
• Passing a Parcel: A gift is passed around a circle of players while music plays.
• Duck, Duck, Goose (or variations like "chorus"): Players sit in a circle, and one person walks around tapping heads.
• Hopscotch (sometimes played with circular patterns).
• Kabaddi (the playing field often has circular markings).

Looking at various drawings, it's important to see if they are perfectly round. Often, drawings made without proper tools might not be perfect circles.

Yes, it is possible to draw a circle on the floor using chalk. One way is to tie a piece of chalk to a string, hold the other end of the string at the center point, and then walk around keeping the string taut while drawing with the chalk. This method helps create a relatively good circle.

Similarly, a circle can be drawn in a notebook using a pencil. The best way to draw a neat circle in a notebook is by using a compass. If a compass is not available, one can trace a round object like a coin or a bangle, or carefully draw it freehand, trying to make it as round as possible.