“9”，（x，y，），，，XY、X、Y，。
Click "Mark Nine Point Rectangle" to mark the following graph (x, y are
used to illustrate the direction of the graph, but not the actual marking). Note
that the direction and position of the short line segment and the triangle in the
upper left corner must be consistent with the figure below. If it is not consistent,
then adjust the XY interchange, X reverse and Y reverse parameters of the
main interface until the marked graphs are in the same direction as the figure
above.
，。9，（5），：
When measuring the coordinates of points, the measurement error should
be reduced as much as possible. Measure the coordinate values of 9 points in
the above figure in turn, based on the center point (point 5), and the sequence
number is as shown in the following figure:
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