#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"
  part:  #arc
  subtype:  #circle_of_curvature__osculating_circle  the circle that touches a curve (on the concave side) and whose radius is the radius of curvature
  subtype:  #equator.circle  a circle dividing a sphere or other surface into two usually equal and symmetrical parts
  subtype:  #epicycle  a circle that rolls around (inside or outside) another circle; generates an epicycloid or hypocycloid

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