| Dodecagonal |
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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: 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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