Question

How many non overlapping triangles can be formed in 11 sided polygon by joining the vertices

Answer 1

The ans is 9 I am not sure

Answer 2

Solution:

I will answer this question by drawing 11 sided polygon as you have not written which kind of polygon it is that is either convex or concave.

Considering the polygon as convex polygon

And a triangle is formed if you join three non Collinear points you get a triangle.

The Word non overlapping means, the two curves that is either two lines or two triangles do not cross each other.

Image of question is described below:

So, if you will look at the image, total number of triangles that can be formed by joining 11 sided polygon by joining the vertices= 9 Triangles