Use this code:
var angle = 1;
function setup() {
createCanvas(800,800);
}
function draw() {
createCanvas(800,800);
background(255);
translate(300,300);
rotate(radians(angle));
noStroke();
scale(2);
blendMode(MULTIPLY);
fill(255,0,0);
ellipse(30,30,60,60);
fill(0,255,0);
ellipse(60,60,60,60);
fill(0,0,255);
ellipse(60,30,60,60);
angle++;
}