Vertical center: the intersection of high lines
Center of gravity: the intersection of center lines
Eccentricity: the intersection of the middle vertical lines (the center of the circumscribed circle)
Center: three centers in one (the intersection of angle bisector, middle line and high line is the same point)
So we can only talk about the center in a regular triangle.
2, if the card center, two ideas.
First, it is proved to be a regular triangle, and then it is arbitrarily proved that the point is one of the bisector of the center line, angle or high intersection point.
The second is to directly prove that the point is any two of the three conditions: the median line or the bisector of the angle or the high intersection point.