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Remember the Pythagorean theorem? A squared plus B squared equals C squared? Now imagine the slope of a roof, and you're trying to determine the length of your rafter. You know the rise (A) and the run (B), so now calculate the length (C). Stairs are much the same. And this just gets you started. A really good framer will also know trig.

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12y ago

What else can I help you with?