Development of Tetrahedron
Purlin or Square Fascia intersects foot of Hip Rafter

Tetrahedron extracted from the Hip Rafter Foot
Development of the Tetrahedron extracted from the Hip Rafter Foot
Trigonometric Scaling of the Tetrahedron extracted from the Hip Rafter Foot
Angles arranged to solve in terms of the Saw Miter Angle (R2) and
Saw Blade Bevel Angle (C1) on the plumb face of the Hip Rafter ...
Tetrahedron angles arranged to solve beginning with saw miter and saw bevel angle on plumb face of Hip rafter
Joe Bartok