Calculate the area and perimeter of triangles, requirements are as follows: 1 Point class design (dot class) 2 Triangle design categories, including at least its constructor, access area and perimeter approach. 3 by the input method to determine the three coordinates of a triangle and the output triangle area perimeter content.计算三角形的面积和周长，要求如下： 1. 设计出Point类（点类） 2. 设计出Triangle类，至少包括其构造方法，获取面积和周长的方法。 3. 通过输入三点坐标的方法来确定一个三角形，并输出三角形的面积周长等内容。

classandobject.doc

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