Find the sum of the radii of the fcircles, which are respectively inscribed and circumscribed about the a regular polygon of n sides.

Prove that the sum of the radii of the radii of the circles,which are,respectively,inscribed and circumscribed about a polygon of n sides, whose side length is a, is (1)/(2)a cot(pi)/(2n) .

The sum of radii of inscribed and circumscribed circles of an n sided regular polygon of side a is

Find the measure of each angle of a regular polygon of 20 sides?

If R is the radius of circumscribing circle of a regular polygon of n-sides,then R =

Prove that the area of a regular polygon hawing 2n sides,inscribed in a circle,is the geometric mean of the areas of the inscribed and circumscribed polygons of n sides.

Find the ratio of the areas of squares circumscribed about and inscribed in the same circle.