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Dodecagon
 

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Dodecagonal




In Geometry , a dodecagon is a Polygon with exactly twelve sides. When spelled uppercase, the outlines of the letters E and H (and I in a Serif font) are all dodecagons.

A regular dodecagon is a dodecagon with all sides having equal length and all interior Angle s having the same size of 150 Degree s. The area of a regular decagon is given by:
A = 3 a^2 \cot rac{\pi}{12} = 3 a^2 \left( 2+\sqrt{3} ight) \simeq 11.1962 a^2.


DODECAGON CONSTRUCTION

A regular dodecagon is Constructible with Compass And Straightedge . The following is a 23 step animation illustrating one way it can be done. Notice that the compass radius is unaltered during steps 8 through 11.

: dodecagons and triangles]]


DODECAGONS IN REAL LIFE




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