Cone, a term in the field of mathematics, has two definitions: analytic geometry definition: the spatial geometry figure composed of a conical surface and a plane intersecting it (satisfying the intersection line as a circle) is called a cone; Definition of solid geometry: The revolving body surrounded by a straight line with a right-angled side of a right-angled triangle is called a cone, and the right-angled side is called the axis of the cone. There are also sand piles, funnels, hats, gyroscopes, hats, pencil heads, drills, plumbs, etc. Everything in life can be approximately regarded as a cone. Sweet cones are also indispensable in daily life. The following are the characteristics of the cone:

1. An object surrounded by a straight line with one right side of a right triangle as the rotation axis and the other two sides rotating is called a cone.

2. A cone consists of a vertex, a side and a bottom. The distance from the vertex to the center of the bottom surface is the height of the cone.

The cone has two faces, the bottom is round and the side is curved.

4. Let the cone expand along the generatrix, which is fan-shaped. The volume of a cylinder is equal to three times the volume of a cone with equal bottom and equal height, which is called a cone.