How to square a room? I am going to make a small shed and I requirement to

I am going to make a small shed and I requirement to know how to square it. I know that if you measure down one side a indisputable distance and down the other side a certain distance that your hypotumus will equal a guaranteed distance. It is something like this ,,, 2ft 4 ft = 6 foot is that correct for the hypotumus. Are there other breadth for larger rooms that follow the same template.

Thanks ,,, sorry for being so wordy

Answers:
The numbers you be thinking of are 3, 4, and 5.
Just measure 3 ft out from a corner of the room, label a mark.
Measure 4 ft out from indistinguishable corner on an adjacent wall, form a mark. Connect the grades with a measure tape. If the cartridge reads 5ft (at the "hypotenuse"), you hold a right angle. Adjust the wall until the hypotenuse reads 5 foot.

To obtain square foot, judge the length, then the thickness. Multiply the length times the width and there's your square footage. For instance, if it's 12 x 10, the sq.ft. is 120.
9 x 12 is 108, etc., etc.

Edit: I'm sorry, I didn't really read your examine thoroughly. The first answer is correct.

Us carpenters get a headache when confronted beside large math problems.

Measure the corner to corner distances diagnolly..if they are like you have a idyllic square.