Assertion: ellipse's distance | /r/Synonym | focal distance
Facets:
Source sentences:
text: The distance c {\displaystyle c} of the foci to the center is called the focal distance or linear eccentricity.
text: The distance between the directrix and the focus is the focal parameter.
text: The distance between the foci is called the focal distance and is usually denoted by $2c$.
text: The distance between the foci is called the focal distance and denoted as \(2c\).