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When the plane cuts entirely across one nappe at a slant, the section is an:
AEnvelope
BEmblem
CEquator
DEllipse
Answer & Solution
Correct answer: D. Ellipse
1. The angle lies between alpha and ninety degrees.
2. The curve is closed but not round.
3. It is an ellipse.
_Source: NCERT Class 11 Mathematics, Ch 10 'Conic Sections'_
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