Math-Trig Sweep by Chord and Radius

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Given CHORD and RADIUS of an arc, returns the SWEEP. You need to load the routine M_Trig_ArcApoByChordRadius before this. By Orso B. Schmid

{ Orso ***************************** }
{ given arc radius and chord, result is the arc sweep }
FUNCTION M_Trig_ArcSweepByChordRadius(chord, radius: REAL): REAL;
		{ arcTangent (chord/2)/apothem) }
		M_Trig_ArcSweepByChordRadius := 
			2 * Rad2Deg(arcTan(
				(chord/2) / M_Trig_ArcApoByChordRadius(chord, radius)