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I have 5 lines (d1 -> d5) equally distributed from each other in 3d perspective, and I have the values of angle (a), (d1) and (b5). I need to calculate (b2, b3, b4, d2, d3, d4, d5).

enter image description here

I can calculate d5 with:

d5 = d1 - ( b5 * Math.tan(a))

but I have no idea how to calculate b2, b3 and b4. (d1 is divided into 4 identical segments.) Any help would be appreciated.

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Welcome to math.SE, razzak! I've taken the liberty of fixing some of your spelling. –  Paul VanKoughnett Mar 8 '13 at 2:05
    
@Paul VanKoughnett: thanks –  razzak Mar 8 '13 at 2:07
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