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.
vertex
hyperbola
focus
ellipse

Explanation:

A hyperbola is defined as the set (locus) of points in a plane where the absolute value of the difference of the distances from two fixed points (foci) is a constant. A vertex is a point on a conic - section (like hyperbola or parabola), but it doesn't describe the entire locus. A focus is one of the fixed points. An ellipse is the locus of points where the sum of the distances from two fixed points (foci) is a constant.

Answer:

B. hyperbola