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Find the area of a regular 36-sided polygon inscribed in a circle of radius 20.

When a regular polygon is inscribed in a circle, the circle is divided into arcs of equal size. The angular size of these arcs is simply related to the size of the interior angles of the polygon. Describe the relationship.

(1 + tan 21 degrees)(1 + tan 28 degrees) * (1 + tan 24 degrees) * (1 + tan 17 degrees) = 4

write it in form of a^3+b^3 as (3x)^3 + (2x)^3 now apply identity and open it

36