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Half circle to enclosure formed by second half-circle with common edge



Function f3d_76 returns the view factor between a half-circle and the surface swept out by a the motion of a second half-circle as it is rotated an angle alpha

The calling protocol is:

F=f3d_76(alpha)

Inputs:
alpha: angle (deg or rad)

Reference: 
Cabeza Lainez, Jose Maria: Solar Radiation in Buildings. Transfer and Simulation Procedures, Chapter 16 of Solar Radiation, Babatunde, E.B., ed., InTech open source publishers, 2012.

Example: 
$UnitSystem Radian
alpha=pi/3
F=f3d_76(alpha)

{Solution:
F=0.5556}