a cone is a geometric figure with two definitions. Analytic geometry definition: The spatial geometry figure composed of a conical surface and a plane that cuts it (the intersection line is a circle) is called a cone. Definition of solid geometry: The geometric body surrounded by the straight line where the right-angled side of a right-angled triangle is located as the rotation axis and the other two sides rotate 36 degrees is called a cone. The axis of rotation is called the axis of a cone. The surface formed by rotating the side perpendicular to the axis is called the bottom surface of the cone. A surface that is rotated by an edge that is not perpendicular to the axis is called the side of a cone. No matter where you rotate, the side that is not perpendicular to the axis is called the generatrix of the cone. (Edge refers to two rotating edges of a right triangle). In life, sand piles, funnels, hats, gyroscopes, hats, pencil heads, drill bits, plumbs, etc. can all be approximately regarded as cones. Cone is also indispensable in daily life. A cone is a geometric figure with two definitions. Analytic geometry definition: the spatial geometry figure composed of a conical surface and a plane that cuts it (satisfying the intersection is a circle) is called a cone. Definition of solid geometry: The geometric body surrounded by the straight line where the right-angled side of a right-angled triangle is located as the rotation axis and the other two sides rotate 36 degrees is called a cone. The axis of rotation is called the axis of a cone. The surface formed by rotating the side perpendicular to the axis is called the bottom surface of the cone. A surface that is rotated by an edge that is not perpendicular to the axis is called the side of a cone. No matter where you rotate, the side that is not perpendicular to the axis is called the generatrix of the cone. (Side refers to two rotating sides of a right triangle) In life, sand piles, funnels, hats, gyroscopes, hats, pencil heads, drill bits, plumbs, etc. can all be approximately regarded as cones.