When the plane cuts at the vertex with $0 \le \beta < \alpha$, the degenerate section is:
Aa single point
Ba straight line
Can ellipse
Dtwo intersecting lines (a pair of straight lines)
Answer & Solution
Correct answer: D. two intersecting lines (a pair of straight lines)
At vertex with $0 \le \beta < \alpha$: plane cuts both nappes through vertex → **two intersecting lines** (degenerate hyperbola).
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