Geremias Blanco
//making size 400×400
size(400,400);
//making red rect size/cords (0,0,200,200)
fill(255,0,0);
rect (0,0,200,200);
//making blue rect size/cords (0,200,200,200)
fill (0,0,255);
rect(0,200,200,200);
//making green rect siz/cord (200,0,200,200)
fill(0,255,0);
rect (200,0,200,200);
// making gray rect size/cord (200,200,200,200)
fill(126,122,122);
rect(200,200,200,200);
// making circle size/cord (200,200,100,100) /stroke(0) transparentcy 75%
stroke(0);
fill(200,200,200,210);
ellipse(200,200,100,100);
and my link to part 3
http://www.openprocessing.org/sketch/87895
If anything is missing please let me know =)