Snyder, Virgil, 1869-1950, Sisam, Charles Herschel, b. 1879 · New York : H. Holt and Company · leaf 79
s called the center. The segments from the center to thevertices are the semi-axes; their lengths are a, 6, c. We shallsuppose the coordinate axes are so chosen that a^h^c > 0. Thesegment joining the vertices on the X-axis is then known as themajor axis; that joining the vertices on the Y-axis… … The semi-axes of this ellipse are a*ji _ ^^ ^-Jl — — . As | A; | in-creases from 0 to c, the axes of the ellipses of section decrease.If \Jc\=c, the ellipse reduces to a point. If j Zc j > c, the ellipseof section is imaginary, since its axes are imaginary. The real part of the…
Geometry, Analytic
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