tough trigonometry problem: 3d modeling a Dodecagon

Robotnik003

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Ok so I am 3d modeling a Dodecagon and I need help with proportions.

So here is the problem (visualized it in paint) :
attachment.php


I need to solve for a and b.
 

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Ok so I am 3d modeling a Dodecagon and I need help with proportions.

So here is the problem (visualized it in paint) :

[snip]

I need to solve for a and b.

Well, you've got three right triangles here, so this seems like a perfect time to utilize the Pythagorean Theorem. Try that and see how far you get. If you're still stuck, then please include all of your work, even if you know it's wrong. Thank you.
 
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