[已解决]平面几何问题之三角形的面积

乐乐学编程

已知三角形的三个顶点，求三角开的面积

最佳答案

月排行榜 / 总排行榜

风过无痕1989

2020-11-28 17:06:34

这题目以前做过练习，直接复制给你好了

1. #include <stdio.h>
   
2. #include <math.h>
   
3. double S_tri(double ax, double ay, double bx, double by, double cx, double cy)
   
4. {
   
5.         double S;
   
6.         S = 0.5 * (ax * (by - cy) + bx * (cy - ay) + cx * (ay - by));
   
7.         if (S >= 0)
   
8.                 return S;
   
9.         else
   
10.                 return (-1.0 * S);
    
11. }
    
12. void main()
    
13. {
    
14.         double S, ax, ay, bx, by, cx, cy;
    
15.         scanf("%lf%lf%lf%lf%lf%lf", &ax, &ay, &bx, &by, &cx, &cy);
    
16.         S = S_tri(ax, ay, bx, by, cx, cy);
    
17.         printf("S_triangle = %lf\n", S);
    
18. }

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跳转到最佳答案楼层

风过无痕1989

这题目以前做过练习，直接复制给你好了

1. #include <stdio.h>
   
2. #include <math.h>
   
3. double S_tri(double ax, double ay, double bx, double by, double cx, double cy)
   
4. {
   
5.         double S;
   
6.         S = 0.5 * (ax * (by - cy) + bx * (cy - ay) + cx * (ay - by));
   
7.         if (S >= 0)
   
8.                 return S;
   
9.         else
   
10.                 return (-1.0 * S);
    
11. }
    
12. void main()
    
13. {
    
14.         double S, ax, ay, bx, by, cx, cy;
    
15.         scanf("%lf%lf%lf%lf%lf%lf", &ax, &ay, &bx, &by, &cx, &cy);
    
16.         S = S_tri(ax, ay, bx, by, cx, cy);
    
17.         printf("S_triangle = %lf\n", S);
    
18. }

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风过无痕1989

1. #include <stdio.h>
   
2. #include <math.h>
   
3. double S_tri(double ax, double ay, double bx, double by, double cx, double cy)
   
4. {
   
5.         double S;
   
6.         S = 0.5 * (ax * (by - cy) + bx * (cy - ay) + cx * (ay - by));
   
7.         if (S >= 0)
   
8.                 return S;
   
9.         else
   
10.                 return (-1.0 * S);
    
11. }
    
12. void main()
    
13. {
    
14.         double S, ax, ay, bx, by, cx, cy;
    
15.         scanf("%lf%lf%lf%lf%lf%lf", &ax, &ay, &bx, &by, &cx, &cy);
    
16.         S = S_tri(ax, ay, bx, by, cx, cy);
    
17.         printf("S_triangle = %lf\n", S);
    
18. }

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