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The fixed line used to define a parabola is called the:
ADimension
BDirectrix
CDiameter
DDiagonal
Answer & Solution
Correct answer: B. Directrix
1. The fixed point is the focus.
2. The curve keeps equal distance from both.
3. The line is the directrix.
_Source: NCERT Class 11 Mathematics, Ch 10 'Conic Sections'_
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