1, which belongs to the prism of cylinder; Cylinder;
2. There are cones belonging to cones; Pyramids;
3. One ball belongs to a sphere.
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.
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.
A space geometry, in which a semicircle rotates a Zhou Suocheng around a straight line equivalent to its diameter, is called a sphere, and the radius of the semicircle is the radius of the sphere. A sphere is a three-dimensional figure with only one continuous surface, which is called a sphere.
Extended data:
1, the basic concept of sphere
(1) The center of a semicircle is called the center of the sphere.
(2) The geometry surrounded by a sphere is called a sphere.
(3) The line segment connecting the center of the sphere and any point on the sphere is called the radius of the sphere.
(4) The line segment connecting two points on the sphere and passing through the center of the sphere is called the diameter of the sphere.
(5) A semicircle takes its diameter as its axis of rotation, and the surface formed by rotation is called a sphere.
2. Spherical function
The equation for a ball with radius r is:?
3. Calculation formula of sphere
The formula for calculating the volume of a ball with radius r is:
The formula for calculating the surface area of a ball with radius r is:
References:
Baidu encyclopedia entry-field
References:
Baidu Encyclopedia Entry-Column
References:
Baidu encyclopedia entry-cone