The answer depends on the angle at which the axis of the cone intersects the cross-sections.
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Circle: If the knife is perpendicular to the axis of the cone.Ellipse: If the knife is between (perpendicular to the axis of the cone) and (parallel to the side of the cone).Parabola: If the knife is between (parallel to the side of the cone) and (parallel to the axis of the cone).Hyperbola: If the knife is parallel to the axis of the cone.Triangle: If the knife is perpendicular to the base of the cone.Point: If the knife is parallel to the base the cone and through the apex
A cone has infinitely many triangles. Each cross-section of a cone, when cut parallel to its base, forms a triangle. As the cone tapers to a point, the triangles formed by the cross-sections become increasingly smaller and numerous. Therefore, a cone can be said to have an infinite number of triangles.
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Depends on the way you cut the cone, but the outline is either an ellipse or a parabola.
The "conic section" that is produced when you slice a cone with a plane that passes through only one nappe of the cone but that is not parallel to an edge of the cone is known as an ellipse. In the case where the plane is perpendicular to the axis of the cone, the ellipse becomes a circle.