How to choose a cone from the suggested shapes?

A cone is a solid shape with a circle-shaped base and a single vertex. If you look at the cone directly, you will see that it looks like a triangle.
 

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As you may see, the cone looks like a cap. It is a solid shape that has one vertex, and the base is a circle. You can see two flat figures in it. If we look at the cone from above or from below, we see a circle. If we look at the cone directly, we see a triangle. If we cut the cone in half from the top to the base, we get a triangle in the section. The cone has no corners. There is only one vertex.
 

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