Question

The picture below illustrates a special type of conic section called a circle.

Which of the following offers the best description of how a circle is formed?
W
A. The plane passes through the vertex of a right circular cone.
B. The plane passes through only one nappe of a right circular cone
and is perpendicular to its base.
C. The plane passes through both nappes of a right circular cone and
is perpendicular to its base.
D. The plane passes through only one nappe of a right circular cone
and is parallel to its base.

Answer 1

D

Explanation:

circles are parallel to the base and therefore only pass through 1 nappe

if the plane weren't parallel, we would make an ellipse