Question

which geometric object is defined as the set of all points in a plane at a given distance from a given point?
a. line segment
b. parabola
c. line
d. circle

Explanation:

A circle is defined in a plane as the set of all points that are at a fixed (given) distance from a given point (the center). A line - segment is a part of a line with two endpoints. A parabola is the set of all points in a plane that are equidistant from a fixed - point (focus) and a fixed - line (directrix). A line is a set of points extending infinitely in two directions.

Answer:

D. Circle