Regular Polygons
Areas of regular polygons  polygons with 3 to 12 sides.
Perimeter of a Regular Polygon
P = n a (1)
where
P = perimeter (m, ft ..)
n = number of sides
a = length of side (m, ft, ..)
Area of a Regular Polygon
A = n a r / 2
= n r^{2} tan(Θ)
= n R^{2} sin(2 Θ) / 2 (2)
Polygon  Number of Sides  n   Area (m^{2}, ft^{2} ..) 

Triangle, equilateral  3  0.4330 a^{2} 
Square  4  1.0000 a^{2} 
Pentagon  5  1.7205 a^{2} 
Hexagon  6  2.5981 a^{2} 
Heptagon  7  3.6339 a^{2} 
Octagon  8  4.8284 a^{2} 
Nonagon  9  6.1818 a^{2} 
Decagon  10  7.6942 a^{2} 
Undecagon  11  9.3656 a^{2} 
Dodecagon  12  11.1961 a^{2} 
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