First, the outer center of the triangle
Definition: The intersection of three perpendicular lines of a triangle is called the outer center.
Second, the center of the triangle.
Definition: The intersection of bisectors of three angles of a triangle is called the center of the triangle, that is, the center of the inscribed circle. Heart is generally represented by letters, and it has the following properties:
Third, the center of the triangle.
Definition: The intersection of three heights of a triangle is called the center of gravity. The center of gravity is generally indicated by letters.
Fourth, the "center of gravity" of the triangle:
Definition: The intersection of the three midlines of a triangle is called the center of gravity. The center of gravity is generally indicated by letters.