http://mathworld.wolfram.com/images/...gment_1001.gif

http://mathworld.wolfram.com/images/...t/Inline44.gifhttp://mathworld.wolfram.com/images/...t/Inline45.gifhttp://mathworld.wolfram.com/images/...t/Inline46.gif

I have R and I have A how do I solve for theta? From there I can figure out h.

Or is there another formula I could use to find h if I only have the Area and the radius?