Question

我试图根据扫描的点找到三角形的角度/边。

因此，计算边，然后计算角度。我的边长似乎是正确的，但是我一直得到错误的角度值。用于公式的值应该是＆＃34; height = 3＆＃34;和＆＃34; sideA = 3.16。＆＃34;现在，如果我直接输入这些值，我会得到正确的结果。如果我使用我的高度和sideA变量，即使输出正确的值，我得到的结果也不正确。

输入＆＃34; 3 / 3.16＆＃34;的值= .949763 ----------------------------------------------- -------------------------------- 输入值为＃34; height / sideA＆＃34; = .74999

编辑：点值为＆＃34;（0.0,0.0）（4.0,0.0）（3.0,3.0）＆＃34;

public class Triangle {

private double sideA;
private double sideB;
private double sideC;
private double height;
private double x1;
private double y1;
private double x2;
private double y2;
private double x3;
private double y3;



public void setX1( double x){

  x1 = x;

}

public void setY1( double y){

  y1 = y;

}

public void setX2( double x){

  x2 = x;

}

public void setY2( double y){

  y2 = y;

}

public void setX3( double x){

  x3 = x;

}

public void setY3(double y){

  y3 = y;

}

public void setHeight(){

  height = (x3 - x1);

}

public double getHeight() {

  return height;

}

public void setLengthC(){

sideA = Math.sqrt(
        Math.pow((x2 - x1), 2.0)
      + Math.pow((y2 - y1), 2.0));
}

public double getLengthC(){

  return sideA;

}


public double getAngleA() {

  double sine = Math.asin(Math.sin(height/sideA));
  return sine;

}


}

这是测试人员类。

 import java.util.*;


public class TriangleTester {

   public static void main(String [] args){

   Scanner scan = new Scanner(System.in);
   Triangle test = new Triangle();



   System.out.print("Please enter a value for X1: ");
   test.setX1(scan.nextDouble());
   System.out.print("Please enter a value for Y1: ");
   test.setY1(scan.nextDouble()); 
   System.out.print("Please enter a value for X2: ");   
   test.setX2(scan.nextDouble()); 
   System.out.print("Please enter a value for Y2: ");
   test.setY2(scan.nextDouble()); 
   System.out.print("Please enter a value for X3: ");   
   test.setX3(scan.nextDouble()); 
   System.out.print("Please enter a value for Y3: ");
   test.setY3(scan.nextDouble());
   test.setLengthC();
   test.setHeight();

   System.out.println("Side a: " + test.getLengthA());
   System.out.println("Side b: " + test.getLengthB());
   System.out.println("Side c: " + test.getLengthC());
   System.out.println("Height: " + test.getHeight());
   System.out.println("Angle A: " + test.getAngleA());



    }
    }

Answer 1

在你的setLengthC（）函数中，你有sideA = x2和x1的距离。将其更改为x3和x2的距离，以便：

sideA = Math.sqrt(
            (Math.pow((x3 - x2), 2.0))
          + (Math.pow((y3 - y2), 2.0)));
    }

找到三角形的边/角

1 个答案: