共回答了13個問題采納率：100%

一般三角形：r=2S/(a+b+c),其中S是三角形面積,a、b、c是三角形三邊.另外S=根號下p(p-a)(p-b)(p-c),其中p=(a+b+c)/2

public class Triple {

private double a;

private double b;

private double c;

public Triple(double a,double b,double c){

this.a = a;

this.b = b;

this.c = c;

}

public static void main(String[] args) {

double x1 = 0,y1 = 0;

double x2 = 0,y2 = 3;

double x3 = 4,y3 = 0;

Point pa = new Point(x1,y1);

Point pb = new Point(x2,y2);

Point pc = new Point(x3,y3);

double a = Point.distance(pc,pb);

double b = Point.distance(pa,pc);

double c = Point.distance(pa,pb);

Triple triple = new Triple(a,b,c);

double s = triple.area();

double r = triple.getInnerRadius();

System.out.println("Area is:" + s);;

System.out.println("Inner r is:" + r);

}

public double area(){

double p = (a + b + c) / 2;

return Math.sqrt(p*(p-a)*(p-b)*(p-c));

}

public double getInnerRadius(){

double s = area();

return 2 * s /(a+b+c);

}

}

class Point{

private double x;

private double y;

public Point(double x,double y){

this.x = x;

this.y = y;

}

public static double distance(Point p1,Point p2){

double square = Math.pow((p1.x - p2.x),2) + Math.pow((p2.y - p1.y),2); //(x1-x2)^2 + (y1-y2)^2

return Math.sqrt(square);

}

}

--------------用一個直角三角形測試

Area is:6.0

Inner r is:1.0

1年前

3

超強干貨來襲 云風專訪：近40年碼齡，通宵達旦的技術人生

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