Calculated Industries 4090 - Manual (Page 66)

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Objects at Right Angles
When you are working with objects at Right Angles, set up the
“Measured Triangles” and subsequent calculations in the same man-
ner as the previous inline objects. Due to the vertical misalignment
of the two ducts, the added step of finding the actual length will
be required.
With the exception of the duct dimensions the measured lengths of
Triangle III are slant lengths. Therefore, if the calculations are
processed using these dimensions the results would also be slant
lengths. To find the actual lengths for “Yp” and “Xp” requires the
erection of two true length Triangles. The true length Triangles will
utilize “Ye” from the elevation offset as the “Y” leg of both triangles
and the measured lengths of “a” and “c” as the “r” legs.