Answer
Sum, Foci
Work Step by Step
An ellipse is the set of all points in the plane for which the "sum"
of the distances from two fixed points F1 and F2 is
constant. The points F1 and F2 are called the "foci" of
the ellipse.
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 11 - Section 11.2 - Ellipses - 11.2 Exercises - Page 796: 1
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