Cut a cylinder, a cone, a frustum, and a frustum with a plane passing through the axis of the following body of revolution

Rectangle triangle trapezoid
It is equivalent to cutting the rotating body vertically from the middle

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11. What is the figure of plane oblique section cone? It's an ellipse if you cut a cylinder obliquely. I know, Ask 2, 3 floor plane oblique section conic get figure is ellipse? Yes or no?
12. What are the figures obtained by cutting a cylinder, a cone or a frustum through the plane of the axis of the following body of revolution? It's urgent. Thank you
13. What figure can be obtained by cutting a cone with a plane parallel to the contour line of the cone? Is it a parabola?
14. A plane parallel to the bottom of a cone cuts the cone, the diameter of the cross section and the bottom is 3cm and 9cm respectively, and the distance between the cross section and the bottom is 4cm Find the area of this cone's axis section
15. If a plane parallel to the ground of the cone divides the cone into two equal segments, then the ratio of the side area of the two parts is I did a good job Can you do me a favor
16. If the cone is cut into two parts with equal side area by a plane parallel to the bottom, and the volume of the small cone is 1, then the volume of the original cone is ()
17. Can the cross section area of a cone cut by a plane be exactly half of the area of the bottom circle
18. When the plane parallel to the bottom of the cone is used to cut the cone, the ratio of the area of the cross section to the area of the bottom is 1:3. The ratio of the two sections which divide the generatrix of the cone into two sections is () A. 1：3B. 1：（3-1）C. 1：9D. 3：2
19. If the plane of the plane section is perpendicular to the axis of the cone, what is the intersection line?
20. The section plane intersects with the axis of the cone A. Circle B. Intersect two lines C. Ellipse