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Can't remember if it was one of those books or not but I referenced a really old carpentry book once. I built a wooden arch for a doorway. Oh my goodness, the math involved! The old school guys had to be mathematicians. Trigonometry, geometry, ratios... I'm not smart enough or schooled enough and was lost immediately. I built it my way, with a measuring tape, string and template material. I have no doubt as to the accuracy of the by the book method but my arch turned out perfect without wracking my brain.
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