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单词 Conchoid of Nicomedes
释义

Conchoid of Nicomedes

中文百科

蚌线 Conchoid (mathematics)

（重定向自Conchoid of Nicomedes）
Conchoids of line with common center.The fixed point O is the red dot, the black line is the given curve, and each pair of coloured curves is length d from the intersection with the line that a ray through O makes. In the blue case d is greater than O's distance from the line, so the upper blue curve loops back on itself. In the green case d is the same, and in the red case it's less.
Conchoïde d'une ellipse

过定点O的直线交不过O的定直线l（l与O的距离为a）于Q，在OQ上取P，使|QP|=b（b是常数），则P的轨迹称为蚌线。

特征

  • 蚌线有内外两支。
  • a和b的大小关系，蚌线有三种不同形态。
英语百科

Conchoid (mathematics) 蚌线

（重定向自Conchoid of Nicomedes）
Conchoids of line with common center.The fixed point O is the red dot, the black line is the given curve, and each pair of coloured curves is length d from the intersection with the line that a ray through O makes. In the blue case d is greater than O's distance from the line, so the upper blue curve loops back on itself. In the green case d is the same, and in the red case it's less.
Conchoïde d'une ellipse

A conchoid is a curve derived from a fixed point O, another curve, and a length d.
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更新时间：2026/3/7 18:35:59