Which method do you use to create a square?

Just curious to get some different opinions here.

When it comes to setting out a square (out on site), which method do you use?

1: Measuring diagonals until they're the same and cross referencing all measurements until a square is formed, or

2: A squared + B squared = C squared

or another method?

I've been taught to use the diagonals approach which is fine, however it seems as if a quick calculation and I can find the exact diagonal number straight off and not have to check and recheck the measurements (ie method 2). What's the consensus?


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