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int x= 200;
int y=200;
int r=60;
void setup () {
size (400,400);
ellipseMode(RADIUS);
}
void draw () {
background (200);
float d= dist (mouseX,mouseY, x,y);
if (d <r) {
fill (255,0,0);
} else{
fill (255);
}
ellipse (x,y,r,r);
}