conchoid

柯林斯詞典

conchoid /?k??k??d/

• 1. N a plane curve consisting of two branches situated about a line to which they are asymptotic, so that a line from a fixed point (the pole) intersecting both branches is of constant length between asymptote and either branch. Equation: (x – a)2(x2 + y2) = b2x2 where a is the distance between the pole and a vertical asymptote and b is the length of the constant segment 蚌線[geometry]

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