Regular Polygon

The angles have the same angle from the center
Number of angles n
Side length a_n
Number of angles n
Side length a_n
Interior angle phi=360°/n
Base angle alpha_n=(1-2/n)*90°
Sum of angles (n-2)*pi
Radius of inner circle r_i=a/(2 tan(180°/n))
Radius of outer circle r_o=a/(2 sin(180°/n))
Area A=n*a*r_i/2
Attention: Formulas are not correct yet. Website under construction.
 Polygon 
 Pentagon: 5 
 Hexagon: 6 
 Heptagon: 7 
 Octagon: 8 
 Nonagon: 9 
 Decagon: 10 
 Polygon: 11 
 Dodecagon: 12 
 Polygon: 13 
 Geometry 2D 
 Circle 
 Triangle 
 Quadrangle 
 Polygon 
 Ellipse 
 Mathematics 
 Geometry 2D 
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