Function to calcuate the area of a given horseshoe shape
- Object containing the outline of a horseshoe shape, output from PtsAlgHorseShoe function
Returns the area of the horseshoe shape with the circular and rectangular portions separated
Currently forces use of a height 5/4 width and r2=2*r1 of origin (center)
 From http://mathforum.org/library/drmath/view/51816.html
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