Maybe using trigonometry... (we learn these things at school for some reason) 
![[Image: TrigonometryMnemonic_1000.gif]](http://mathworld.wolfram.com/images/eps-gif/TrigonometryMnemonic_1000.gif)
You know O (0.4) and h (0.6)
sinØ = 0.4 / 0.6
sinØ = 0,66666666666666666666666666666667
The inverse of sinØ will get you the degree you are looking for: 41.810314895778598065857916730578
but, 41.810315 should be ok.
![[Image: 44056176.png]](http://imageshack.us/a/img213/1108/44056176.png)
Two bar (clones); rotate around a picked axis by 41,810315 degrees; vertices adjustments (also, using intersect); dissolve some faces and weld everything.
You know O (0.4) and h (0.6)
sinØ = 0.4 / 0.6
sinØ = 0,66666666666666666666666666666667
The inverse of sinØ will get you the degree you are looking for: 41.810314895778598065857916730578
but, 41.810315 should be ok.
Two bar (clones); rotate around a picked axis by 41,810315 degrees; vertices adjustments (also, using intersect); dissolve some faces and weld everything.