Classification Of Triangles
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00:00Hi kids, today we will learn about triangles.
00:06So let's get started.
00:09Here we have a triangle.
00:13Triangle is a three-sided polygon.
00:17It has three sides or edges, three vertices and three internal angles.
00:27Now we will learn more about triangles.
00:34Triangles can be of different types depending on the length of its sides and the angles
00:41that are formed between the sides.
00:45First let's see types of triangles based on the length of its sides.
00:53An equilateral triangle is a triangle in which all the three sides are equal or congruent
01:01to each other and also the three internal angles are also or congruent to each other.
01:12That is, all the sides and all the angles are equal.
01:20Here all the sides of this triangle measures 5 cm in length and all the angles measures
01:2960 degrees, so it's an equilateral triangle.
01:36These are a few examples of equilateral triangles.
01:42Now let's learn what are isosceles triangles.
01:47An isosceles triangle is a triangle in which two of the three sides are equal or congruent
01:55to each other and also two of the internal angles are equal or congruent to each other.
02:06Here the sides AB and AC are congruent to each other or are the same and angle B is
02:19congruent to angle C or are equal.
02:25So it's an isosceles triangle where the two sides and two internal angles are equal.
02:35These are a few examples of isosceles triangles.
02:41Now let's learn what are scalene triangle.
02:46A scalene triangle is a triangle in which none of the three sides are equal or congruent
02:54to each other and also none of the three internal angles are equal or congruent to
03:03each other.
03:06Here in this triangle all the three sides are different.
03:12All the angles too are different so it's a scalene triangle.
03:20These are a few examples of scalene triangles.
03:26In all these triangles all sides have different lengths and all internal angles are different.
03:37Now let's classify triangles based on the size of angles.
03:44Kids, we must be knowing that three angles of a triangle always adds up to 180 degrees.
03:56That is whichever triangle you take, sum of three internal angles is always 180 degrees.
04:06Now let's learn what is an acute triangle.
04:12A triangle in which all angles are less than 90 degrees or are acute angles is called an
04:22acute triangle.
04:25For example, in this triangle all the angles are less than 90 degrees so it is an acute
04:34triangle.
04:37Now let's learn what is a right triangle.
04:43A triangle in which one of the angle is right angle or 90 degree angle is called right triangle.
04:56There can be only one right angle in a triangle.
05:01Here are a few examples of right triangles.
05:09Now let's learn what are obtuse triangles.
05:14A triangle in which one of the angle is more than 90 degrees or an obtuse angle is called
05:23an obtuse triangle.
05:27Kids, there can be only one obtuse angle in a triangle.
05:33Here are some more examples of obtuse triangles.
05:40So kids, we have learned triangles based on sides are scalene triangles where length of
05:50all sides is different.
05:53Isosceles triangle where length of two sides is equal.
06:01Equilateral triangle where length of all sides is equal.
06:08We also learned about triangles based on angles.
06:14Acute triangle where all angles measures less than 90 degrees.
06:20Right angle triangle where one of the angle is 90 degrees.
06:27So kids, now you may go ahead and take a quiz to learn more.
06:32Bye bye.