Question

1. choose the best answer.

a ___ is the locus of points in a plane such that the difference of the distances to two fixed points called the foci is a constant.
branch
focus
hyperbola
vertex

Explanation:

A hyperbola is defined as the set (locus) of points in a plane where the absolute value of the difference of the distances to two fixed points (foci) is a constant. A branch is a part of a hyperbola. A focus is one of the fixed points. A vertex is a specific point on a hyperbola (or other conic sections).

Answer:

hyperbola