Depends on the way you cut the cone, but the outline is either an ellipse or a parabola.
The answer depends on the angle at which the axis of the cone intersects the cross-sections.
cone
No because it would be smaller.
cone
The cross section will be a triangle with base 2 feet and a vertical height of 9 feet.
The vertical cross section of a right vertical cone is a triangle if that cross section is taken from the vertex. Any other vertical cross section will reveal a hyperbola (with endpoints on the base of the cone). A link can be found below.
Circle
The answer depends on the angle at which the axis of the cone intersects the cross-sections.
If it a right cone then it is a circle, otherwise an ellipse.
Circle
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When a cone is sliced by a slanted plane, the cross section formed is typically an ellipse. The exact shape can vary depending on the angle and position of the plane relative to the cone. If the plane is parallel to the cone's base, the cross section will be a circle; if it intersects the cone at a steeper angle, the resulting shape will be an ellipse.
If a cut is made parallel to the base of a cone, the shape of the cross section is a circle. This circular cross section maintains the proportional dimensions of the cone's base, and its radius decreases as the cut moves closer to the apex of the cone. The resulting circles are similar to the base of the cone but vary in size depending on the height at which the cut is made.
A cross section of a right circular cone is a two-dimensional shape obtained by slicing the cone perpendicular to its axis. Depending on the position of the cut, the cross section can be a circle, an ellipse, or a triangle. If the cut is made parallel to the base, the cross section will be a smaller circle. If the cut is made vertically through the apex and perpendicular to the base, it will form a triangle.
A circular cross-section.
cone
By definition, the circular cross-section of a cone changes linearly in width as you go along its axis. By definition, the cross-section of a prism is constant along its axis. So, by definition, a cone prism is an impossible shape.