java由三点求三角形的周长public class Point {int x;int y;Point(){ }Point(int a,int b){x=a;y=b;}}public class Triangle {Point n1,n2,n3;Triangle(Point n1,Point n2,Point n3){n1=new Point();n2=new Point();n3=new Point();}double x1=Math.pow(n1.x-

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