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

In geometry, a hexacontatetragon (or hexacontakaitetragon) is a sixty-four-sided polygon, or ''64''-gon. (In Greek, the prefix hexaconta- means 60 and tetra- means 4.) The sum of any hexacontatetragon's interior angles is 11160 degrees.
==Regular hexacontatetragon==
The ''regular hexacontatetragon'' can be constructed as a truncated triacontadigon, t, a twice-truncated hexadecagon, tt, a thrice-truncated octagon, ttt, a fourfold-truncated square, tttt, and a fivefold-truncated digon, ttttt.
One interior angle in a regular hexacontatetragon is 174°, meaning that one exterior angle would be 5°.
The area of a regular hexacontatetragon is (with )
:A = 16t^2 \cot \frac
and its inradius is
:r = \fract \cot \frac
The circumradius of a regular hexacontatetragon is
:R = \fract \csc \frac

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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