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main.c
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#include<stdio.h>

#define pi 3.14
void main()
{
  int r ;
  float a,c;
  printf("Eter  the radius :");
  scanf("%d ",r);

  a=pi*r*r;
  c=2*pi*r;

  printf("The area is :%d",a);
  printf("The circumference is : %d",c);
getch();

}