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For smooth operation start with the default values.
An arch is to be constructed out of four lengths. Two lengths
at each end are of unit length; the other middle two are of RAFTER LENGTH.
The end length has an angle of HIP LEAN with the vertical; the middle lengths
have an angle of ROOF LEAN with the vertical and a pitch PITCH.
The ends of the lengths are to be beveled. The middle lengths have an
INCLUDED angle or an angle read on a saw SCALE at the PEAK end and at the
RAFTER end next to the HIP end of the end length. The end length has a
bevel with an INCLUDED angle and a SCALE angle that might be read on a saw
at the HIP end next to the middle length and at the FOOT end next to the ground.
...crown molding calculator...
...pipe and tube bends...
...vector cross product...
Credits and references:
has some units conversion factors that even
do not have.