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单词 parabola
释义 parabola
A conic with eccentricity
e = 1
. It is the locus of a point that moves so that its distance from the focus is equal to its perpendicular distance from the directrix . A chord through the focus, perpendicular to the axis, is called the latus rectum . For a parabola with its vertex at the origin, lying symmetrically about the x-axis, the equation is
y2 = 4ax
, where a is the distance from the vertex to the focus. The directrix is the line
x = -a
, and the latus rectum is 4a. See illustration.

A parabola
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更新时间:2025/6/22 16:49:46