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What does the center in the line and surface of high school mathematics mean?
There are several places in the center that need attention.

1, the center of the line segment is the midpoint of the line segment,

2. The center of a plane figure means that only figures with symmetrical centers have centers.

The so-called central symmetry is defined in this way. If any point on the graph and the symmetrical point of the point are still on the graph, the graph forms a central symmetric graph, which is called the symmetric center of the graph. If the center of the circle is a square or rectangle.

3. The center of a triangle is an alternative concept. A triangle has no center of symmetry, and a regular triangle has no center of symmetry. Because people are used to it, the center of a triangle actually means that when the inscribed circle and the circumscribed circle coincide, that is, the center of a regular triangle, the outer center recombines what "center" means that the triangle is not a centrally symmetrical figure.

Cubes, cuboids and spheres are all centrally symmetric figures;