Regular polygon and its area

The angle formed by the side of a regular polygon at its centre is 45^@ . Name the polygon.

What is the difference between a regular polygon. and an irregular polygon ?

The angle formed by the sides of a circular regular polygon at its centre is 36^@ . Find the number of sides of polygon.

Regular polygon a polygon is called a regular polygon if all its sides are equal and all its angles are equal.

The area of the circle and the area of a regular polygon of n sides and of perimeter equal to that of the circle are in the ratio of

The area of the circle and the area of a regular polygon of n sides and the perimeter equal to the circle are in the ratio of

(a) Is it possible to have a regular polygon with measure of each exterior angle as 22^(@)? b) Can it be an interior angle of a regular polygon? Why?