The Tetrahedron Trigonometric Identity Formulas by Joe Bartok are what I consider the most important roof framing document developed over the last 100 years. The Timber Framing Hawkindale Angle Formulas developed by Rees Hawkins Acheson from the Martindale Hip and Valley Roof Angles were the first Tetrahedron development for roof framing angles, but Joe Bartok's Tetrahedron Trigonometric Identity Formulas gave us the ability to find the roof framing angles in any type of Tetrahedron.
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