1. Because the isosceles right triangle AC=BC=40, AB=40 times the root number 2, and CD=20 times the root number 2. Because CD is quartered, the length of the first article is a quarter AB= 10 times the root number 2, the length of the second article is half AB=20 times the root number 2, and the length of the third article is four.

2. Take the largest side 30 times the root number 2 as the side of the square, then the largest area is 1800.