If joining vertices of a polygon of a polygon with n sides makes 12n traingles , then find the value of n .

Find the number of diagonals in a polygon with n sides.

IF a polygon of n sides has 275 diagonals then n=

If a polygon of n sides has 275 diagonals,then n=

The number of diagonals of a polygon of n sides is-

An n sided polygon has 'n' diagonals, then the value of n is :

Let T_(n) denote the number of triangles which can be formed using the vertices of a regular polygon of n sides . If T_(n+1)-T_(n)=21 then find the values of n .

Let T_n be the number of all possible triangles formed by joining vertices of an n - sided regular polygon . If T_(n+1)-T_n=10 , then the value of n is :