You can very quickly construct a square.

There is 2 Ways.

Method 1

1. Press -icon under polygons.
2. Press the drawing pad, where points A and B must be. (The distance between A and B is the distance on the pages of your regular polygon.)
3. Now enter the, how many edges / corners your polygon must have. There are standard 4.
4. Press OK.

Method 2

This is a method of, when you need to construct a square with a more specific page length, such as is 3.4 long:

1. Press -icon and then press the drawing pad.
2. Enter the length of the side length of the square. (remember to use sentence-NOT COMMA – by decimal)
3. You have now designed a line AB.
4. Press -icon under polygons.
5. Press the drawing pad, where the points A and B is already. (The distance between A and B is the distance on the pages of your regular polygon.)
6. Now enter the, how many edges / corners your polygon must have. There are standard 4.
7. Press OK.