how do we calculate the area of regular polygons ?

What are regular polygons?
   
Regular polygons are polygons with all sides and all angles equal


Some examples of these are
-Pentagons
-hexagons
-heptagons 


The formula to this :


Area = (½)nas


n = number of sides
a = apothems = length of a side




  
This table shows that the formula is 1/2 times the N(number) of sides, A(apothem) and side length (R)


Example:
   Pentagons - 5 (1/2 x a s)