Learn how to check for square and correct it using the 3-4-5 rule or a tape measure with this detailed guide for beginner woodworkers.
rULE 1 – THE 3-4-5 METHOD OR RULE
The 3-4-5 method is essentially the Pythagorean theorem method. Remember that Algebra you swore you’d never use in real life? You may need it to build that bookshelf after all.
RULE 2 – USING A TAPE MEASURE
Use your tape measure and take a measurement from one corner to the one diagonally across from it.
How to correct for square
Once you measure the diagonals, push the opposite corners with the larger diagonal towards each other. This will push out the two adjacent sides and help correct for square.
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