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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 ) : and its inradius is : The circumradius of a regular hexacontatetragon is : 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「Hexacontatetragon」の詳細全文を読む スポンサード リンク
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