DOME FORMULAS

First of all, you need this simple formula:

dome radius = strut length/strut factor

which is the same as:
strut length = dome radius * strut factor

Now all you need are the strut factors!

 Strut Strut factor Dome Sphere A 1.05146 25 30 5-way connectors 6 12 4-way connectors 5 0

 Strut Strut factor Dome Sphere A .61803 35 60 B .54653 30 60 4-way connectors 10 0 5-way connectors 6 12 6-way connectors 10 20

 Strut Strut factor 3/8 5/8 Sphere A .34862 30 30 60 B .40355 40 55 90 C .41241 50 80 120 4-way connectors 15 15 0 5-way connectors 6 6 12 6-way connectors 25 40 80

 Strut Strut factor Dome Sphere A .25318 30 60 B .29524 30 60 C .29453 60 120 D .31287 70 120 E .32492 30 60 F .29859 30 60 4-way connectors 20 0 5-way connectors 6 12 6-way connectors 65 150

 Strut Strut Factor Dome Sphere A .19814743 30 60 B .23179025 30 60 C .22568578 60 120 D .24724291 60 120 E .25516701 70 120 F .24508578 90 120 G .26159810 40 60 H .23159760 30 60 I .24534642 20 30 4-way connectors ?? 0 5-way connectors 6 12 6-way connectors ?? ??

 Strut Strut Factor Dome Sphere A .1625672 30 60 B .1904769 30 60 C .1819083 60 120 D .2028197 90 180 E .1873834 30 60 F .1980126 60 120 G .2059077 130 240 H .2153537 65 120 I .2166282 60 120 4-way connectors ?? 0 5-way connectors 6 12 6-way connectors ?? ??