Click here for descriptions, formulas and diagrams of the more commonly used roof framing angles. More extensive lists of the trigonometric Hip/Valley roof framing and joinery angle formulas known to date are in the first three links below.

    Factored Formulas is the result of efforts to express all known Hip / Valley angle formulas as vector products in terms of only four factors. The resulting equations are used in the Javascript version of  Lag .

    The TFA Program referred to in Alternate LAG Program Applications is the original version of the LAG worksheet.