Hi guys, welcome to another class on the Gis channel and today we're going to talk about the classification of triangles. Do you have questions and want to learn more about this content? So come with me.
. . But you must be wondering Gis, a triangle isn't everything that has three sides, it's not called a triangle because then I have to bring up the classification of these triangles, calm down guys, because like that, triangles are classified in two ways first they are classified according to the size of each side of their sides and they are classified according to their angles right so it will receive two classifications and then there will be names for you to memorize or try to memorize, right Gis , it’s not about memorizing, memorizing.
Alright guys, so before I explain this content to you, I want to ask you for those two things, just like the triangle, there are two classifications , right? in the little star in the corner here and leave your jewel, ok? So let's go, when I talk about the classification of triangles, I'm referring to triangles that are classified in relation to the size of their sides, okay, so look at the first triangle that I brought up called an equilateral triangle, equilateral is what that triangle is that it has three equal sides, right, you can see that the triangle that I brought here can measure what I brought here, okay, it has three sides measuring 21 cm, so that means I can, if it's in that position, I can come here and do it what and turn it like this, this will do the same thing right because it has three equal sides so it is called an equilateral triangle, ok?
Now the second case that I brought up, a triangle can be classified according to the size of its sides, it is called an isosceles triangle because it is isosceles because an isosceles triangle has two equal sides, two equal sides so it is enough that it has two sides equal, it is called isosceles, okay, so that means that a triangle that is trying to escape here, an equilateral triangle, it is isosceles, it has two equal sides, no, it is not, this classification of an isosceles triangle has two equal sides, so analyze carefully if it does. two equal sides is called isosceles, well, in this case, an equilateral triangle that has two equal sides wants to escape from here, it is also called isosceles, that's right guys because it has two, repeating two equal sides, okay, and here lastly I brought the triangle called scalene and scalene that the angle that has the three different sides, I even brought the measurements here real measurements, okay guys, this side measuring 20 cm, this side 26 and this side 30 centimeters, see that the three measurements are different, that's why it receives the name of scalene triangle and here of isosceles I didn't say it, right, but look here this side this side measures 24 cm and this side measures 21 so we have a different side, okay, you can see if I turn this triangle here, look here, look If I turn it around, it won't happen the same thing that happened here in the equilateral area, okay, because then it will change, the bigger side stayed here now, right, and then the bigger side, the smaller side stayed here, which is 21, it came here and not here. it's 21, it's 24 which has to be one of the larger sides so be careful with that guys and then there's a way, I'm going to go back and get it right here, there's a way to memorize it so always, when I studied I always tried to do an analogy analogy is a comparison that I remembered something I remembered something to memorize the name of triangles so think like this with me the equilateral triangle which is one that has three equal sides think that it is in balance all the sides are equal everything is fine it's in balance, okay, remember, little word equi is for you to remember equilateral side of sides and equi of equal sides are all equal, and isosceles when I studied I thought like this isosceles what the isosceles represented has an isolated side like this isolated side o has a isolated side a side that is different from the others and then as this side was different from the others I said that it was an isolated side then I remembered isolated I remembered in isosceles, I remembered the beginning of the words that's it what I really did, people, I'm not lying, and the scalene, what I did with the scalene, the scalene, oh, I thought like that, he escaped from the others here, why did he escape because all the measurements were different, so he didn't fit in in neither of the two here, so it was a triangle that escaped all definitions and was the scalene triangle, ok guys, I hope that this analogy that I made when I was studying helps you also memorize what the name of triangles is when I refer to to its sides to the size of its sides ok now let's see how triangles are classified when I look at their angles, shall we?
Guys, the other classification of triangles is when I look at their angles, when I look at their angles, okay, so don't forget about the sides, now I'm looking at the angles, that's our focus, so take a good look at the triangle, it goes be called an acute-angled triangle, look at the beautiful names that are acute-angled when it has three angles less than 90°, so you must remember the class with Gis, who explained the classification of angles, so I leave the indication here, you go back to review, right, how the angles were classified and then you can identify here so the triangle is called an acutangle when the three, the three, okay, angles that are less than 90°, so here I even brought a triangle, right, real and official, these measurements, okay guys whose angle is 50 degrees, this one is 70, this one is 60, right, so these three angles are less than 90, so my triangle is called an acute triangle, okay, it comes from the acute angle, okay, I'll tell you the acute angle, okay, look at the second example, the triangle goes be called a right-angled triangle, okay, it's not the rectangle there when I talk about that quadrilateral that has four sides, our quadrilateral with four sides, well, that's what I said, hey guys, it's for you to pay attention, right ? a triangle will be called a right triangle, ok when it has an angle of 90 degrees it has a right angle, because when I talk about the classification of angles when I have an angle of exactly 90 degrees it is called straight so if you look at some exercise that has a triangle that has a right angle , there's a right angle that can't have two, right ? it's a right angle, a 90 degree angle, it's this little square with this little ball here in the middle, okay, so you saw an exercise like this, you already know what a 90 degree angle is, okay, and the other case we have of a triangle when I look at yours angles is the obtuse triangle, look at the size of the name obtuse, which is an obtuse triangle, is a triangle that has an angle greater than 90° and look, I brought you an angle that measures 100, one that measures 35 and another that measures 45° right, so this triangle here is considered an obtuse triangle because it has this angle here greater than 90 degrees, that's all it takes to have an angle greater than 90°, but it is possible to have two 90° angles in a triangle, don't we, because If you stop to observe, look here, add it up, add it up mentally, it's easy, 100 with 35 from 135 with 45 from 180, come back here with me, look 45 with 45= 90 with 90 from here 180 look at the other one here 70 with 50= 120 with 60= 180, then you will take one more conclusion home, what is the conclusion that every triangle results in the sum of angles equal to 180 degrees, it cannot exceed 180°, that is why there is a triangle, it cannot have two angles of 90, there is no how to close the triangle then it won't be a triangle, okay, so the limit sum is always 180°, the sum of the three angles, okay guys, so the obtuse triangle will have an angle greater than 90 and it is called obtuse angle due to the angle obtuse which is an obtuse angle, even an angle greater than 90 and less than 180°, that's why I told you to go back and watch the class on the classification of angles, right, well, remember, when I talk about the classification of triangles it has two classifications regarding its sides and its angles, okay, so it has both classifications, so pay close attention to what Gis explained here, if you have any doubts, come back, analyze it carefully and you will classify the triangles depending on what is in the statement, if the statement says what the name of the triangle is according to its sides, then it can be equilateral, isosceles and scalene if the statement says classify the triangles according to the size of the its angles will be acute, rectangle or obtuse, right guys, I hope you understood and enjoyed Gis's class, ok and if you liked it, what's the request I'm going to make, subscribe to the channel, click on the little star in the corner so you can subscribe to the channel and receive notifications of the next classes that publish it, ok?
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br, the same will be here, right from the description for you, then you look for which list you want, which content you want, enter this list, solve the list and you can still check If you got the exercise right because Gis provided the answer sheet, that's it, it's easy for you to study, but look, one thing doesn't count and copy the answer sheet, so how will you know if you understand the content or not? It's not really people, so don't forget to go to the Gis website and access the lists that I left there for you, but if you didn't find the list you were looking for, don't be mad, I'm already providing all the lists and there will be everything for you agreed? So I hope you enjoyed it and until next class, bye.
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