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  1. import java.io.*;
  2. class Main{
  3. 	public static void main(String[] args)throws Exception{
  4. 		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  5. 		String str = br.readLine();		//x1 y1 x2 y2 x3 y3 xp yp r
  6. 		String[] str1 = str.split(" ");
  7. 		double[] a = new double[9];		//x1 y1 x2 y2 x3 y3 xp yp r
  8. 		double[] b = new double[6];		//a1 b1 a2 b2 a3 b3
  9. 		double d1=0,d2=0,d3=0,s1=0,s2=0,s3=0,flag1=0,flag2=0,flag3=0;
  10. 		for(int i=0;i<=8;i++){
  11. 			a[i] = Double.parseDouble(str1[i]);
  12. 		}
  13. 		for(int i=0;i<=4;i+=2){
  14. 			b[i] = (a[(i+3)%6]-a[i+1])/(a[(i+2)%6]-a[i]);	//傾き (y2-y1)/(x2-x1)
  15. 			b[i+1] = a[i+1]+(-1*(b[i]*a[i]));	//切片 y1+(-1*(傾き*x1))
  16. 		}
  17. 		//円の中心から各線分までの距離
  18. 		if(b[0]!=Double.POSITIVE_INFINITY && b[0]!=Double.NEGATIVE_INFINITY){
  19. 			d1 = Math.abs( (a[6]*b[0])+(a[7]*-1)-b[1] ) / Math.sqrt(b[0]*b[0]+1);
  20. 		}else{
  21. 			d1 = a[0];
  22. 		}
  23. 		if(b[2]!=Double.POSITIVE_INFINITY && b[2]!=Double.NEGATIVE_INFINITY){
  24. 			d2 = Math.abs( (a[6]*b[2])+(a[7]*-1)-b[3] ) / Math.sqrt(b[2]*b[2]+1);
  25. 		}else{
  26. 			d2 = a[2];
  27. 		}
  28. 		if(b[4]!=Double.POSITIVE_INFINITY && b[4]!=Double.NEGATIVE_INFINITY){
  29. 			d3 = Math.abs( (a[6]*b[4])+(a[7]*-1)-b[5] ) / Math.sqrt(b[4]*b[4]+1);
  30. 		}else{
  31. 			d3 = a[4];
  32. 		}
  33. 		//各頂点が円の中にあるか外にあるか
  34. 		if( ((a[0]-a[6])*(a[0]-a[6]) + (a[1]-a[7])*(a[1]-a[7])) >= a[8]*a[8]){
  35. 			flag1 = 1;
  36. 		}
  37. 		if( ((a[2]-a[6])*(a[2]-a[6]) + (a[3]-a[7])*(a[3]-a[7])) >= a[8]*a[8]){
  38. 			flag2 = 1;
  39. 		}
  40. 		if( ((a[4]-a[6])*(a[4]-a[6]) + (a[5]-a[7])*(a[5]-a[7])) >= a[8]*a[8]){
  41. 			flag3 = 1;
  42. 		}
  43. 		//面積の処理をするかしないか
  44. 		if(a[8]>d1 && flag1==1 && flag2==1){
  45. 			s1 = AB(d1,a[8]);
  46. 			System.out.println("s1:"+s1);
  47. 		}else{
  48. 			System.out.println("線分ABにおける面積はありません");
  49. 		}
  50. 		if(a[8]>d2 && flag2==1 && flag3==1){
  51. 			s2 = BC(d2,a[8]);
  52. 			System.out.println("s2:"+s2);
  53. 		}else{
  54. 			System.out.println("線分BCにおける面積はありません");
  55. 		}
  56. 		if(a[8]>d3 && flag3==1 && flag1==1){
  57. 			s3 = CA(d3,a[8]);
  58. 			System.out.println("s3:"+s3);
  59. 		}else{
  60. 			System.out.println("線分CAにおける面積はありません");
  61. 		}
  62. 	}
  63. 	public static double AB(double d1,double r){
  64. 		double l = Math.sqrt(r*r-d1*d1)*2; //弧の底辺の長さ
  65. 		double cosA = ((r*r)+(r*r)-(l*l))/(2*r*r); //余弦定理による角度cosA
  66. 		double rad = Math.acos(cosA); //アークコサインでラジアン出力
  67. 		double s = (0.5)*(r*r)*( rad - Math.sin(rad) ); //面積
  68. 		return s;
  69. 	}
  70. 	public static double BC(double d2,double r){
  71. 		double l = Math.sqrt(r*r-d2*d2)*2; //弧の底辺の長さ
  72. 		double cosA = ((r*r)+(r*r)-(l*l))/(2*r*r); //余弦定理による角度cosA
  73. 		double rad = Math.acos(cosA); //アークコサインでラジアン出力
  74. 		double s = (0.5)*(r*r)*( rad - Math.sin(rad) ); //面積
  75. 		return s;
  76. 	}
  77. 	public static double CA(double d3,double r){
  78. 		double l = Math.sqrt(r*r-d3*d3)*2; //弧の底辺の長さ
  79. 		double cosA = ((r*r)+(r*r)-(l*l))/(2*r*r); //余弦定理による角度cosA
  80. 		double rad = Math.acos(cosA); //アークコサインでラジアン出力
  81. 		double s = (0.5)*(r*r)*( rad - Math.sin(rad) ); //面積
  82. 		return s;
  83. 	}
  84. }
Success #stdin #stdout 0.03s 245632KB
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stdin
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-5 0 0 5 0 -5 0 0 5
stdout
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s1:7.13495408493621
s2:39.269908169872416
s3:7.13495408493621
https://ideone.com/E9z31
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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