Determine Reference point for Pentagram

Trigonometry equalities, inequalities and expressions - sin, cos, tan, cot

Determine Reference point for Pentagram

Postby stockgoblin » Tue Jun 18, 2013 11:27 am

Hi,

I'm encountering a system that uses all sorts of five sided stars. I need to establish a way of picking one of the points as a reference point so I can label all the others. I assume I have to use a constant.

Just looking for brainstorming:

What method would you use to determine outer point "A" on a five sided star?
stockgoblin
 
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