• 3 months ago
Transcript
00:00Hi kids! Today we will learn symmetrical figures, asymmetrical figures, and line of symmetry.
00:13So let's get started. Here is an image of a heart. Can you fold it exactly halfway so
00:24that its two halves are exactly similar or one half completely covers the other half?
00:33Let's try. Here we are folding it. Yeah! It completely covers the other half. And when
00:45you can fold a shape in half and one half exactly covers the other half, we can say
00:53that the shape is symmetrical. And the fold line is the line of symmetry. So this shape
01:05is a symmetrical shape. And this line of fold that divides this shape into two similar halves
01:15is the line of symmetry. Now let's try this with another figure. Here we have an image.
01:27Let's try to fold it and see if it is a symmetrical figure or not. Here we are folding it. Yes!
01:39If we fold this image here, it completely covers the other half. So it's a symmetrical image.
01:48And this line of fold is its line of symmetry. Now let's try the same with another figure.
02:02Here is a rectangle. Let's fold this rectangle halfway. If we fold it here, it does not work.
02:12Example, one half does not cover the other half. So let's try another way. Let's fold it this way.
02:25Yeah! If we fold it here, it works. That is, one half is completely covering the other half.
02:35So we got to know that this figure is symmetrical. And this line of fold is the line of symmetry.
02:47Now kids, you have a fair idea what are symmetrical figures and what is line of symmetry.
02:57Now let's see a few examples of some symmetrical figures and their line of symmetry. Here we have
03:09a butterfly. And we can fold it exactly halfway. So it's a symmetrical figure. And the line of fold
03:20is the line of symmetry. Here we have another symmetrical figure, a rabbit. And we can fold it
03:33exactly halfway. So it's a symmetrical figure. And the line of fold is the line of symmetry.
03:45Here are some more examples. A is a perfect example of symmetrical figures. This smiley too!
03:58And this trapezium too! Have a look at all these figures and their line symmetry.
04:09Kids, now let's learn making a symmetrical figure. It's interesting! Let's take a piece of paper.
04:21Now fold it halfway. And make any shape along the fold, like this. And cut it out.
04:33Now open the fold. What do you see? Here is a symmetrical shape with two halves that can cover each other.
04:46And this line of fold is our line of symmetry. You can make many symmetrical figures this way.
04:57Now let's learn about the line of symmetry of a circle. Here we have a circle. Is it a symmetrical figure?
05:11Let's find it out by folding it halfway. Yes! If we fold it halfway, its one half covers the other half completely.
05:25So it's a symmetrical figure. Now let's see how many lines of symmetry can you make in a circle.
05:36Try folding the circle halfway. We can fold it here. We can fold it here too.
05:47So we can make any number of lines of symmetry in a circle.
05:54As all the lines that pass through the center of the circle are lines of symmetry.
06:03Now let's see some asymmetrical figures. This is an asymmetrical figure.
06:12As we can't fold it into two halves that can cover each other, like this.
06:22Here are some more examples. Have a look. These figures are asymmetrical.
06:32These numbers and characters are perfect examples of asymmetrical figures.
06:40Now you may go ahead and take a quiz to learn more. Bye-bye!