How many diagonals can be drawn by joining the angular points of a polygon of n sides?

How many lines can be drawn through three non-collinear points?

The number of diagonals of a polygon of 20 sides is :

Find the number of triangles whose angular points are at the angular points of a given polygon of n sides, but none of whose sides are the sides of the polygon.

How many triangles can be drawn through n points on a circle ?

How many diagonals a regular hexagon has ?

How many circles can be drawn to pass through two given points?

How many lines can be drawn through 6 points on a circle ?

The number of diagonals of a regular polygon of n sides are:

Consider a polygon of sides 'n' which satisfies the equation 3*^(n)P_(4)=^(n-1)P_(5) . Q. Number of quadrilaterals thatn can be formed using the vertices of a polygon of sides 'n' if exactly 1 side of the quadrilateral in common with side of the n-gon, is