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var hit = false;
let circle
function draw() {
createCanvas(700, 700)
background(255);
ellipse(200,200,100,100);
ellipse(mouseX,mouseY,50, 50);
hit = collideCircleCircle(mouseX,mouseY,150,200,200,0)
if (hit){
fill(0, 0, 255);
ellipse(200,200,100,100);
}
}