
How to draw a root 2 rectangle, or the Golden Rectangle.

Step 1
Start by drawing a square. I have chosen to use dotted lines to express all root values.

Step 2
Pin your compass at the lower left hand side of the square. Take your compass and measure it to the upper right corner of the square.

Step 3
With your compass anchored strike and arc from the top of the upper right hand corner.

Step 4
With your ruler extend the two parallel or top and bottom lines of your box.

Step 5
Erase the circle leaving only the interior lines.

Step 6
Erase the arc.

Step 7
Now you have your root 2 rectangle.