Question

If a polygon has n sides , the number triangles formed will be

a) n
b) (n - 3)
c) 2n
d) (n - 2)

Answer 1

Answer:

Step-by-step explanation:

Solution

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Correct option is

A

5

we know that a triangle needs 3 vertices to be formed so out of n vertices 3 should be chosen=  

n

C  

3

​

 

According to the given condition, we can write that

n+1

C  

3

​

−  

n

C  

3

​

=10

⇒  

n

C  

2

​

=10

⇒n=5

Video Explanation