Q.

Which of the following is not a conic section?

A. apex
B. hyperbola
C. ellipse
D. parabola
Answer» A. apex
Explanation: conic sections are formed when a plane cuts through the cone at an angle with respect to the axis of the cone. if the angle is right angle then the conics is a circle, if the angle is oblique then the resulting conics are parabola and ellipse.
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