createCanvas(400, 400);

}

​

function draw() {

  background(220);

  let centerX = 300;

  let centerY = 160;

  let diameter = 80;

  circle(centerX, centerY, diameter);

  circle(centerX, centerY, 2);

  text("Center X: " + centerX,  4, 16);

  text("Center Y: " + centerY,  4, 32);

  text("Diameter: " + diameter, 4, 48);

}