Assertion: circle | /r/DefinedAs | the set of points
Facets:
value: in terms of two different foci
type: OTHER
value: in a plane
type: LOCATION
Source sentences:
text: Apollonius of Perga showed that a circle may also be defined as the set of points in a plane having a constant ratio (other than 1) of distances to two fixed foci, A and B.
text: A circle of a sphere can also be defined as the set of points at a given angular distance from a given pole.
text: A circle can also be defined as the circle of Apollonius, in terms of two different foci, as the set of points having a fixed ratio of distances to the two foci.