Grant explains why A4 paper has to be 8 x 11.5 inches Posted on 2020/07/30 by Carl Robitaille Bonus material from my video with @3blue1brown yesterday – Grant explains why A4 paper has to be 8 x 11.5 inches… pic.twitter.com/0oqEjRV8Jt— Dr Tom Crawford (@tomrocksmaths) July 30, 2020