Definitions

from The Century Dictionary and Cyclopedia

  • n. In geometry, as the pole (x1, y1) glides along a straight line, the perpolar will not in general turn about a point, but about some curve. But in three cases, when x1 is constant, when y1 is constant, when y1: x1 is constant, that is, when the pole moves on a straight line parallel to either axis or through the center, the perpolar turns about a point, the perpole of the straight line.

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