I like when teachers explain the roots of the word, it's meaning ! Only like this math becomes easier delightful to understand and practice. Thank you Eddie for one more great video to all of us !! 🏆
@jahiempirl51294 жыл бұрын
He teaches so perfectly wish he was my teacher
@yingo40984 жыл бұрын
But he's in Australia 🇦🇺
@-sumeya-70743 жыл бұрын
@@yingo4098 well good for meee
@addinshaw43224 жыл бұрын
Never failing to teach information with each video, very nice
@raemiles89494 жыл бұрын
Never fails to teach so well in each video he makes!!
@naomiandrzejczuk11954 жыл бұрын
Very easy to understand! Symmetry has been the easiest thing in geometry so far!
@austinbayne93494 жыл бұрын
These help since we can’t be at school
@nayanalukus41584 жыл бұрын
This helped so much!
@THEBIGGESTB0AT4 жыл бұрын
Keep up the good work!!!
@emmagorencic58824 жыл бұрын
Great way of teaching and the help while not in school
@briannaryan28254 жыл бұрын
great video!
@trucc81174 жыл бұрын
So cool how rotational symmetry works
@justinhooper85394 жыл бұрын
Thanks for teaching this
@mearaboehm64564 жыл бұрын
Good video!
@jordandaum15554 жыл бұрын
good video, easy to understand
@shantellphillips25364 жыл бұрын
great video
@jackjacobs74684 жыл бұрын
nice video, so simple
@dealayjamontgomery42824 жыл бұрын
it helps alot
@heavenlyb86004 жыл бұрын
Nice Video
@someoneyk61653 жыл бұрын
honestly wow wow WOW
@TLHAFullEpisodes2 жыл бұрын
Great
@madisonbrown61974 жыл бұрын
Good video
@justinhooper85394 жыл бұрын
🐐🐐
@racistpianist2 жыл бұрын
Let's draw an Isosceles triangle. It's a triangle in which two of the sides are equal to each other. And we had seen in the previous video, that it has a vertical axis of Symmetry. If this part is flipped to the other side, we see that the two parts match exactly. And that's why we say that this shape is symmetrical. This is called reflection symmetry. Why is it called that? Let's see. If we take one part and keep it against a mirror, we will get the original shape. The reflection of one part completes the shape. But wait, what is the other kind of symmetry? Do we have another kind? To know the answer here's another figure for you. This figure is made up of six squares to be precise. Now I want you to tell me if this shape has reflection symmetry or not. Can we draw a line through it, such that the two parts formed match exactly with each other? If we try out different lines we realize that no such line can be drawn. This shape has no reflection symmetry, but what the shape has is 'rotational symmetry'. Yes ! 'Rotational symmetry'. What does that mean? As the name suggests, let's try rotating the figure about its center point. And what does rotating about a center point mean? Take the example of this triangle. If we rotated about its center point, it will rotate like this. If we rotate it about this point, it will rotate like this. And if we rotated about one of its vertices it will rotate like this. The shape will rotate differently depending on the point around which it is rotated. Now let's come back to our figure. We rotate the figure completely around the center point once, and see how many times it looks exactly like the original one. Rotating it completely, means rotating it by 360 degrees. Let's have a counter on the right which counts the number of times the rotated figure looks like the original. Let's start! Now the figure rests at zero degrees. After rotating it by 90 degrees. We get this shape. It's not the same as the original. The counter is still at zero. Okay, so let's rotate the original shape by 180 degrees. And we see that it looks exactly like the original shape. It fits in perfectly. We see an increment of one on the counter. We continue rotating it till we finish one complete rotation. Rotating it by 270 degrees gives us the shape which is not the same as the original. And rotating it by 360 degrees gives us the original shape back . The counter changes to two. What does this two tell us? It tells us that when this figure is rotated completely by 360 degrees, the rotated image looks exactly like the original image twice. Once at 180 degrees, and another at 360 degrees. So we say that this shape has rotational symmetry of order two. To recap, when do we say that a shape has rotational symmetry? Okay, this is long. So I want you to listen to it carefully. A shape has rotational symmetry if, it looks exactly like the original shape, a number of times when rotated about the center point by 360 degrees. Here, the number of times it looks like the original is 2. So we say that this shape has rotational symmetry of order 2. Is it easy to find the order of rotational symmetry? Let me give you a few shapes, and why don't you try finding their order of rotational symmetry. First, an oval looks like this. Next a square, an equilateral triangle and a circle. Each of them has rotational symmetry, but we need to find the order. We begin with the oval shape and start rotating it. Let's see how many times the rotated image looks like the original. Once and twice. We saw that it looks like the original shape two times after the complete rotation. Its order of rotational symmetry is two. In a similar way why don't you try finding the order of rotational symmetry, for these three shapes? Let's start rotating the square now about its centre point. 90 degrees, 180 degrees, 270 degrees and 360 degrees. Clearly, the order of rotational symmetry for a square is 4. Now for the equilateral triangle. 120 degrees at 240 degrees, And at 360 degrees. Three times in one complete rotation, the order is three. And now we come to the circle. What do you think will be the answer here? No matter how we rotate the circle, it will always match the original shape . It will have rotational symmetry of order Infinity. So remember, a shape has rotational symmetry if it looks exactly like the original shape. A number of times when rotated about the center point by 360 degrees.
@LRA072 жыл бұрын
Is this in college? cuz i learned it in Class 4
@thv_lvr5 жыл бұрын
Yo!
@Manigo17436 ай бұрын
The S is not symmetric. The loops are not the same size.
@sazidhasansafwan4 ай бұрын
wtf
@me-ie5no4 жыл бұрын
Are you teaching a class or your class or your a visiter teacher? Do you speak chinese?
@jsridhar722 жыл бұрын
Very worst camera position. Cant see clearly the white board. Thumbs down.