Gravity center memory formula
The three midlines must intersect, and the location of the intersection is really strange. The intersection is named "center of gravity", and the nature of the center of gravity should be clear.
In the division of center of gravity, the ratio of line segment to several segments can be determined, and the ratio of length to length is two to one, so we should use it flexibly and master it well.
Center of gravity: refers to the intersection of the three midlines of a triangle.
External memory formula
A triangle has six elements, three internal angles have three sides, which are the middle vertical lines of the three sides, and the three lines intersect at one point.
This point is defined as the epicentre and can be used as the circumscribed circle. Don't confuse inner heart with outer heart, it is the key to cut inside and connect outside.
Exterior center: refers to the intersection of the vertical lines of the three sides of a triangle, also called the vertical line.
Heart break memory formula
The angle is three heights, and the three heights must intersect at the vertical center. The high line is divided into triangles, and the right angle is three pairs.
There are twelve right-angled triangles, forming six pairs of triangles with similar shapes, which can be found in the four-point * * * diagram, and can be found clearly after careful analysis.
Vertical center: The intersection of three high lines of a triangle is called the vertical center of the triangle.
Internal memory formula
A triangle corresponds to three vertices, each corner has a bisector, and the three lines intersect at a certain point, which is called "inner heart" and has roots.
The points to the three sides are equidistant, which can be used as a triangle inscribed circle. This center of the circle is called "inner heart", so it is natural to define it.
Inner heart: The intersection of bisectors of three internal angles of a triangle is called the inner heart of the triangle. The center of the inscribed circle.