#circle  ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point; "he calculated the circumference of the circle"
  supertype:  #ellipse__oval  a closed plane curve resulting from the intersection of a circular cone and a plane cutting completely through it; "the sums of the distances from the foci to any point on an ellipse is constant"
  subtype:  #circle_of_curvature  #equator.circle  #epicycle
  part:  #arc  a continuous portion of a circle

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