A polyhedron has two parallel faces with the same size, and the intersection lines of the other two adjacent faces are parallel to each other, so this polyhedron is a cylinder; In addition, cylinders can also be divided into positive cylinders and oblique cylinders. Cylinders, separable cylinders, prisms.

Second, the cylinder:

A cylinder is a geometric body formed by taking the straight line of one side of a rectangle as the rotation axis and the other three sides rotating around the rotation axis once. It has two parallel circular bottoms with the same size and 1 curved sides. Its lateral spread is rectangular.

Third, the prism:

Prism is a common three-dimensional polyhedron in geometry, which refers to a closed geometry that two parallel planes are vertically cut by three or more planes.

If the number of planes used to cut parallel planes is n, then this prism is called an n prism. For example, a triangular prism is a closed geometric figure cut vertically from two parallel planes and three planes.

Four, vertebral body:

Vertebra refers to a three-dimensional figure including a cone and a pyramid. , defined by a circular or other closed plane base and a surface formed by line segments connecting each point on the base boundary to a common vertex.

Verb (abbreviation for verb) pyramid:

In geometry, pyramid, also known as pyramid, is a three-dimensional polyhedron, which consists of each vertex of a polygon connecting a straight line to a point outside its plane. The polygon is called the bottom of the pyramid. With the shape of the bottom, the name of the pyramid is different, depending on the polygon at the bottom. For example, a pyramid with a square base is called a square pyramid, a pyramid with a triangular base is called a triangular pyramid, and a pyramid with a pentagonal base is called a pentagonal pyramid.

Six, cone:

A cone is a geometric figure with two definitions.

1, Analytic Geometry Definition: A spatial geometry consisting of a conical surface and a plane intersecting it (the intersection line is a circle) is called a cone.

2. Definition of solid geometry: The geometry formed by taking the straight line on the right side of a right triangle as the rotation axis and the other two sides rotating 360 degrees is called a cone. The axis of rotation is called the axis of a cone. The surface formed by rotating a surface 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. (An edge refers to two rotating edges of a right triangle).

Extended data:

Cylinders, cylinders, prisms, cones, pyramids and cones are common figures in solid geometry. Mathematically, solid geometry is the traditional name of three-dimensional Euclidean space geometry-because in fact, this is roughly the space in which we live. Generally as a follow-up course of plane geometry.

Stereo measurement involves volume measurement of different shapes: cylinder, cone, frustum, cone, cone, cone, cone, cone, cone, cone, cone, cone, cone, cone, cone, cone, cone, cone, cone. Ball, prism,? Wedge? Bottle caps or something. ? Pythagoras School studied spheres and regular polyhedrons, but before Plato School began to study them, people knew little about pyramids, prisms, cones and cylinders. Eudoxus established their measuring method and proved that the volume of a cone is one third of that of a cylinder with equal bottom and equal height, and may be the first person to prove that the volume of a sphere is proportional to the cube of its radius.

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