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In geometry, Heron's formula (sometimes called Hero's formula), named after Hero of Alexandria,〔(【引用サイトリンク】url=http://recursostic.educacion.es/descartes/web/materiales_didacticos/formula_heron/formula_de_Heron.htm )〕 gives the area of a triangle by requiring no arbitrary choice of side as base or vertex as origin, contrary to other formulas for the area of a triangle, such as half the base times the height or half the norm of a cross product of two sides. ==Formulation== Heron's formula states that the area of a triangle whose sides have lengths ''a'', ''b'', and ''c'' is : where ''s'' is the semiperimeter of the triangle; that is, : Heron's formula can also be written as : : : : 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「Heron's formula」の詳細全文を読む スポンサード リンク
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