.~.~ Property of circle or ellipse

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434 / | HD | EDUCATION AND DEMONSTRATION |

188 | DF | MATHEMATICS {4} |

211 | DF | .~ Geometry, trigonometry, or physical mathematic model structure {5} |

214 | .~.~ Property of circle or ellipse |

Property of circle or ellipse:

(under subclass 211) Subject matter relating to characteristics of a closed plane curve every point of which is equidistant from a fixed point within the curve, or characteristics of a closed plane curve generated about two points in such a way that the sums of its distances from two fixed points is a constant.