#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
clrscr();
float A,B,C,S,G;
float G1,P,R,R1;
 printf("Input A,B,S -> ");
 scanf("%f%f%f",&A,&B,&S);
 G=2*S/(A*B);
 G1=sqrt(1-G*G);
 C=sqrt(A*A+B*B-2*A*B*G1);
 P=A+B+C;
 R=A*B*C/(4*S);
 R1=2*S/P;
 printf(" P = %.2f\n R = %.2f\n R1 = %.2f\n",P,R,R1);
getch();
}

#include<stdio.h>
#include<conio.h>
#include<math.h>
void main()
{
clrscr();
float a,b,c,d,y,x;
printf("BBegu c, d, b, x -> ");
scanf("%f%f%f%f",&c,&d,&b,&x);
a=c*d/(c*c-d*d);
printf("%f\n",a);
if(a<5)
  y=a+b/sqrt(25+x*x);
else
  y=b*cos(a);
printf("y = %.2f\n",y);
getch();
}