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In geometry, given a triangle ''ABC'', there exist unique points ''A´'', ''B´'', and ''C´'' on the sides ''BC'', ''CA'', ''AB'' respectively, such that: : * ''A´'', ''B´'', and ''C´'' partition the perimeter of the triangle into three equal-length pieces. That is, :::. : * The three lines ''AA´'', ''BB´'', and ''CC´'' meet in a point, the trisected perimeter point. This is point ''X''369 in Clark Kimberling's ''Encyclopedia of Triangle Centers''. Uniqueness and a formula for the trilinear coordinates of ''X''369 were derived by Peter Yff. ==See also== *Bisected perimeter point 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「Trisected perimeter point」の詳細全文を読む スポンサード リンク
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