Sum of interior angles of polygon

The sum of interior angles of a polygon of n sides is __________right angles.

Draw any polygon and divide it into triangular parts. Work out the sum of interior angles of the polygon.

We know that the sum of the interior angles of a triangle is 180^(@). Show that the sums of the interior angles of polygons with 3,4,5,6 sides form an arithmetic progression.Find the sum of the interior angles of a 21 sided polygon.

Find the sum of the interior angles of a polygon of 8 sides.

The sum of all interior angles of a polygon is 1440^(@) . The number of sides of the polygon is

The sum of the interior angles of a polygon is 1260^(@) . The number of sides of the polygon is :