345 rule, trade secret, everybody should know this trick
This is one of the handy tricks used by builders and makers, taking advantage of the convenient hypotenuse of 3 x 4 dimensions Amazon String line https://geni.us/4mOW2H6 Tape measure https://geni.us/hL3ZRx Speed square https://geni.us/eaVM Framing square https://geni.us/t8k5T
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