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tetradecagon : ウィキペディア英語版
tetradecagon

In geometry, a tetradecagon (or tetrakaidecagon) is a 14-sided polygon or 14-gon.
==Regular tetradecagon==
A ''regular tetradecagon'' has Schläfli symbol and can be constructed as a quasiregular truncated heptagon, t, which alternates two types of edges.
The area of a regular tetradecagon of side length ''a'' is given by
:A = \fraca^2\cot\frac\simeq 15.3345a^2
===Construction===
As 14 = 2 × 7, a regular tetradecagon cannot be constructed using a compass and straightedge. However, it is constructible using neusis, or with an angle trisector. The animation below gives an approximation of about 0.05° on the center angle:
File:Approximated_Tetradecagon_Inscribed_in_a_Circle.gif
Construction of an approximated regular tetradecagon

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「tetradecagon」の詳細全文を読む



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