Calculated Industries 4090 - Manual (Page 70)

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Calculating Angles Between Objects (“Angle Between”)
The Triangle, having a total of 180°, is the basic logic used to solve
for the angle between two objects. To accomplish this task, two
measurable Triangles are established between the objects for the
purpose of finding the angles C, A, and A2, as indicated in the
example below. Subtracting the sum of Angles C, A, and A2 from
180° gives us the “Angle Between” the two objects.
The calculations to solve for the next application are based on the
dimensions being slant lengths as it would be in any dimensions
actually taken in the field. The actual length must be established
prior to finding the “Angle Between” (AB).