Question

please tell me the answer step by step​

Answer 1

Answer:

(ii) 36

Step-by-step explanation:

8th triangle will consist of 8 layer of dots i.e. 1+2+3+4+5+6+7+8=36

Answer 2

By pattern wise, if you look at all the triangles there is a pattern:
1. One dot
2. Three dots
3.Five dots=3+2+1=5
4.4+3+2+1= 10
5. 5+4+3+2+1= 15
6. 6+5+4+3+2+1= 21
7. 7+6+5+4+3+2+1= 28
8. 8+7+6+5+4+3+2+1= 36 dots

So the answer for 8th triangles will be 36 dots.