SOLUTION: Which essential points are found in every parabola? Which are not? Why

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Question 942099: Which essential points are found in every parabola? Which are not? Why
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
A parabola has a vertex (point on the parabola where its curvature is greatest), and is defined by a point (focus) and a line (directrix). The parabola is the set of all points equidistant from the focus and directrix.