considering the plane "in category" and "rectangle" in the relationship, as the starting point will be different, a variety of forms, such as : a rectangle that can be targeted by the two types of objects composed points (upper left and lower right), could also be considered in rectangular points on the basis of added width and high consisting of,

矩形--20032734(刘洁）
.....................\Debug
.....................\rectangle.cpp
.....................\Rectangle.h
.....................\矩形.dsp
.....................\矩形.dsw
.....................\矩形.ncb
.....................\矩形.opt
.....................\矩形.plg
.....................\矩形.sln
.....................\矩形.vcproj

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