A parabola is the locus of points equidistant from a fixed point and a fixed line. The fixed point and the fixed line are called, respectively:
Acentre and axis
Bapex and base
Cvertex and tangent
Dfocus and directrix
Answer & Solution
Correct answer: D. focus and directrix
Parabola: locus of points equidistant from **focus** and **directrix**.
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