createCanvas(600, 400);

  frameRate(24)

}

​

let d = 24; // declaring and instantiating a variable

​

function draw() {

  background(245, 245, 255);

  // drawing the left circle

  fill(0,0,255);

  stroke(0,0,255);

  fill(255);

  ellipse(200, 200, d, d); // using the diameter instead of dimensions

  console.log("diameter is: " + d);

  d = d + 1; // adding one to the diameter value every time the draw function loops

  if (d > 200) {

    d = 10;

  }

}