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Let's do this problem.

2
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Name each of the triangles in two ways.

3
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All right, this is a very basic question, but it'll help you to solidify your fundamentals.

4
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Let's do it together.

5
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We have this triangle over here.

6
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You can see that two sides are equal.

7
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So therefore, this is an isosceles triangle, right?

8
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Now, what about this triangle over here?

9
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You can see that all the three sides are of different measure.

10
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Therefore, this is a scaling triangle.

11
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Right.

12
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OK, what about this triangle?

13
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Two sides are equal.

14
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Therefore, this is an isosceles triangle.

15
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And over here also, you can see that two sides are equal.

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This is an isolationist triangle.

17
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And in this triangle over here, you can see that all the three sides are equal.

18
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Therefore, this is an equilateral triangle.

19
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So we have classified the given five triangles on the basis of sides.

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Now, let's do it on the basis of angles.

21
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Over here you can see that all the angles are acute angles or less than 90 degrees.

22
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Therefore, this is an acute angle triangle.

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What about this triangle over here?

24
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You can see that one angle is 90 degrees.

25
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Therefore, this is a right angle triangle.

26
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What about this triangle over here?

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You can see that one angle.

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This angle over here is greater than 90 degrees.

29
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Right?

30
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So that's an obtuse angle.

31
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Therefore, this triangle is an obtuse angle triangle.

32
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What about this triangle?

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Over here?

34
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You can see a 90 degree angle is there in this triangle.

35
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Therefore, this is the right angle triangle.

36
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And in this triangle, you can see that all the angles are acute angles.

37
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And because it's an equilateral triangle, we know that all these angles will be equal to 60 degrees,

38
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which is less than 90 degrees or acute angles.

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Therefore, this triangle over here is an acute angle triangle.