Find the number of diagonals that can be drawn by joining the angular ponts of decagon .

Find the number of diagonals that can be drawn by joining the angular points of a heptagon.

Find the number of diagonals that can be drawn by joining the angular points of a a polygon of 20 sides.

Find the number of diagonals that can be drawn the joining angular points of a Decagon.

Find the number of diagonals that can be drawn the joining angular points of a Hexagon.

Find the number of diagonals that can be drawn the joining angular points of a Heptagon.

Find the number of diagonals that can be drawn the joining angular points of a Octagon.

Find the number of diagonals that can be drawn the joining angular points of a Pentagoan.

What is the number of diagonals which can be drawn by joining the angular points of a polygon of 100 sides?

The number of triangle that can be formed by joining the angular points of a decagon is

The number of diagonals that can be drawn by joining the vertices of a heptagon