void setup () {
size (600,600);
}
void draw () {
background (255,255,255);
tr (300,300,100); 
}
void tr ( int x, int y, int a ) {
  int x1=x-round(a*cos(PI*30/180));
  int y1=y-round(a*sin(PI*30/180));
  int x2=x-round(a*cos(PI*150/180));
  int y2=y-round(a*sin(PI*150/180));
  int x3=x-round(a*cos(PI*270/180));
  int y3=y-round(a*sin(PI*270/180));
  
 
    line (x1,y1,x2,y2);
    line (x2,y2,x3,y3);
    line (x3,y3,x1,y1);
    
int x4=x+round(a*cos(PI*30/180));
int y4=y+round(a*sin(PI*30/180));
int x5=x+round(a*cos(PI*150/180));
int y5=y+round(a*sin(PI*150/180));
int x6=x+round(a*cos(PI*270/180));
int y6=y+round(a*sin(PI*270/180));

if (a>0) {
tr (x4,y4,a/2);
tr (x5,y5,a/2);
tr (x6,y6,a/2); 
  }
}