The conic section formed is circle.
What is conic section?
"A conic section is a curve obtained as the intersection of the surface of a cone with a plane".
For the given situation,
If a plane intersecting a double-napped cone is perpendicular to the central axis, the conic section formed is circle. Because the slope of the plane is less than the slope of the axis line.
Hence we can conclude that the conic section formed is circle.
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