A regular polygon has 20 sides. Find the number of diagonals of the polygon.

Find the number of diagonals of a 16-sided polygon.

Find the number of diagonals of a 10-sided polygon.

Find the number of diagonals of a polygon of 20 sides

Find the numbers of diagonals in the polygon of n sides.

Find the number of diagonals of a polygon of 10 sides.

If a polygon has 6 sides, then the number of diagonals of the polygon is _______

If a polygon has 8 sides, then the number of diagonals of the polygon is _____.

The interior angles of a regular polygon measure 150^(@) each.The number of diagonals of the polygon is

If each interior angle of a regular polygon is 135^@ , then the number of diagonals of the polygon is equal to