单词	hyperbola
释义	hyperbola A conic with eccentricity e > 1. It has two branches (see graph). For a hyperbola centred at the origin, the transverse axis runs along the x-axis between the vertices and has length 2a. The conjugate axis runs along the y-axis and has length 2b. There are two foci on the x-axis at (ae, 0) and (-;ae, 0). The latus rectum , the chords through the foci perpendicular to the transverse axis, have length 2b2/a. The equation of the hyperbola is: x2/a2 - y2/b2 = 1 ,and the asymptotes are y = ± bx/a. A hyperbola
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