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.

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