Refers to the intersection of the median vertical lines (median vertical lines) of three sides of a triangle. With this point as the center, the circumscribed circle of the triangle can be drawn. Refers to the center of the circumscribed circle of a triangle, which is generally called the outer center of the triangle. The outer center of a triangle is the intersection of the perpendicular lines of three sides, and the distance from this point to the three vertices of the triangle is equal. The epicenter is the intersection of the perpendicular bisector of the three sides of the triangle, which is the center of the circumscribed circle.

The distance from the heart to the three sides is equal, which is the center of the inscribed circle.

The center of gravity of a triangle is the intersection of the three midlines of the triangle. When the geometry is uniform, the center of gravity coincides with the centroid.

The intersection of three heights of a triangle is called the vertical center of the triangle.

The vertical center of acute triangle is in the triangle, and the vertical center of right triangle is at the right vertex; The vertical center of an obtuse triangle is outside the triangle.