Which of the following best provides the mathematical definition of a parabola?

All points in a plane that are the same distance from a fixed point (the focus) and a fixed line (the directrix).

All points in a plane that are a fixed distance from a central point.

The set of all points where the sum of the distances to two fixed points is constant.

A U-shaped curve that is symmetric about an axis.

Focus of a Parabola Practice — Grade 8 math