A decagon has ____ diagonals.

In a polygon, if these exist even one line, which when joining two points of a polygon, does not lie inside the polygon completely, then that polygon is a

Number of side of a Decagon is.

If each angle of a rhombus is right angle, then rhombus is a

Sum of angles of a decagon is.

Find the number of sides of a regular polygon whose each exterior angles has a measure of 60^o.

The value of x in the given figure is.

Sum of exterior angles of a heptagon is.

In a polygon, if the line joining any two points lies inside the polygon, then the polygon is a

Number of diagonals of a quadrilateral is.