Center of gravity: the line connecting the vertex of the triangle with the midpoint of the opposite side intersects at a point, which is called the center of gravity of the triangle;

Vertical center: the height of each side of the triangle intersects at a point, which is called the vertical center of the triangle;

Exterior center: the perpendicular lines of each side of a triangle intersect at a point, which is called the exterior center of the triangle;

Inner heart: the bisectors of the three inner angles of a triangle intersect at one point, which is called the inner heart of a triangle;

Center: The center of a regular triangle is called the center of a regular triangle, where the center of gravity, the center of gravity, the outer center and the inner center coincide.