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The Pythagorean Theorem: a^2+b^2=c^2, for checking squareness, a critical rule in carpentry. If two adjacent and perpendicular walls in a room are legs of a triangle, points a and b can be marked on each leg respectively and hypotenuse c measured with a tape measure (c) to confirm squareness or degree out of square. This can be used in many applications from framing to tiling. Most carpenters I've met use the 3-4-5 rule and don't even know what it's called!

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16y ago

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