Angle of cut
I need the angle I should be mitering for a decagon shape, 10 sided shape.

Angle of cut
What should the mitre saw angle be for a decagon (10 sided) frame be?

Depends. Are all sides equal? And are you just trying to miter, or compound miter? Are you trying to make some kind of flat picture frame or?

Actual angle36 * miter angle 18*

angle of mitre saw for decagon frame
All sides are the same. I'm making a decagon (10 sided) waterbed frame, and the side boards are 1"x 9"x 29". The boards will be on edge, so I need the angle to set my mitre saw at. Thanks.

360 degrees in a circledivide by the number of cornersthen half of that for the miter angle

For shapes in a simple plane ...
180 degrees divided by the number of sides examples 180 / 4 sides = 45 degrees 180 / 6 sides = 30 degrees 180 / 10 sides = 18 degrees 
Google is your friend....
http://en.wikipedia.org/wiki/Decagon The angle depends on which reference you want. Internal angle is 144 deg.....or 36 deg from each point....(360 deg/10) 
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