算弧长.c

计算弧长的公式

#include <stdio.h>
#include <conio.h>
#include <math.h> 
#define pi 3.141593

int main(void) 
{ 
  float result; 
  float radius,width,arc,high;//半径（直角斜边c），弦长（2*直角边a），弧长，弧高（直角斜边c-直角边a）
  float centre,radian;//圆心角角度，圆心角弧度
  float sinc,cosc,tanc,ctgc;//正弦，余弦，正切，余切

   
  printf("请输入弦长 = ");
  scanf("%f",&width);
  printf("\n");
  
  printf("请输入弧高 = ");
  scanf("%f",&high);
  printf("\n");
  
  radius=(((width/2)*(width/2))+(high*high))/(2*high);
  sinc=(width/2)/radius;
  
  
  if (radius<high)
     radian =(2*pi- asin(sinc));	
  else
     radian = asin(sinc);
     
  centre=radian/pi*360;

  cosc=cos(radian);

  tanc=tan(radian);

  ctgc=1/(tan(radian));

  arc=radius*radian;

  printf("半径= %f\n",radius);
  
  printf("直径= %f\n",radius*2);

  printf("圆心角= %f\n",centre);

  printf("弧度= %f\n",radian);
  
  printf("弧长= %f\n",arc);

  printf("正玄= %f\n",sinc);

  printf("余玄= %f\n",cosc);
  
  printf("正切= %f\n",tanc);
  
  printf("余切= %f\n",ctgc);

  getch();
}