Answer
2. An ellipse
Work Step by Step
Consider an ellipse of the form:
$\frac{x^2}{a^2}+\frac{y^2}{b^2}=1$
the sum of the distances from any point P to the foci is constant and always equal to $2a$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 13 - Section 13.2 - The Ellipse and the Hyperbola - Vocabulary and Readiness Check - Page 936: 2
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