Question

Find the number of non overlapping triangles can be formed in 9 sided polygon by joining the vertices.
options
5
7
6
4​

Answer 1

Answer:

hey

Step-by-step explanation:

good morning

(≡^∇^≡)(≡^∇^≡)

Answer 2

Answer:

18 points,5 collinear :

(a) No. of lines =

18

C

2

-

5

C

2

+ 1 = 153 - 10 + 1 = 144

(b) No. of Δ

s

=

18

C

3

-

5

C

3

= 816 - 10 = 806.