This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to square a room
Measure the diagonals from all four corners of the room.
Take a tape measure and measure the distance from one corner to its diagonal, and then measure the diagonal between the remaining two corners. If you were to string lines across the corners you measured, they would form an " x ".

1). Know that if the measurements equal one another, your room is square. That's all there is to it! If your measurements do not equal one another, adjust the assembly until the diagonals equal one another.;
2). For example, if the room features two tall walls, you would use three three-foot square or " x " sections and four one-foot squares. The space between the diagonals is roughly 15 feet square.;
3). The right side of the floor should be 4' x 4' = 400 square feet. By rotating the right side clockwise, you will take out all of the corners or consequently all surrounding areas in a single vertical strip.;
4). Start with the middle corners, and then work your way towards the ends. If you are measuring a bedroom wall, then measure the distance between the bottom of the wall and the top of the bed.;
The answer is:
1).