Draw circle using Trig functions

[MultiMedia]

Hello, can someone help me out? I am trying to draw and display a circle on the CMD using Trigonometric functions like Sin and Cos. How can I go about drawing something like this?

Any tips are appreciated.

[skaa]

void	t_25()
{
  double	fi,fir;
  double	rad;
  double	x,y;
  int	nl;
  int	jy;

  rad=20;
  for(jy=0;jy<rad;jy++)printf(" ");
  for(fi=180,nl=-rad;fi>=0;fi--)
  {
    fir=fi*M_PI/180;
    x=rad*cos(fir);
    y=rad*sin(fir);

    for(;nl<x-1;nl++)
    {
      printf("\n");
      for(jy=0;jy<rad;jy++)printf(" ");
    }

    for(jy=0;jy>-y;jy--)
      printf("\b");
    for(;jy<0;jy++)
      printf("*");
    for(;jy<y;jy++)
      printf("*");
    for(;jy>0;jy--)
      printf("\b");
  }
  printf("\n");
}