alleryWhen the plane is perpendicular to the axis of the cone, the section is a:
ACycloid
BCatenary
CCardioid
DCircle
Answer & Solution
Correct answer: D. Circle
1. A cut square across the cone gives a symmetric closed curve.
2. That curve has every point the same distance from the axis.
3. When the angle with the vertical axis is a right angle, the section is a circle.
4. So the answer is a circle.
_Source: syllabus Mathematics, Ch 10 'Conic Sections'_
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