The 3v Dome Calculator is a geodesic dome calculator from DesertDomes.com. Calculation for a dome of diameter 7 is shown in the images below. Note that any units may be applied to the numbers shown, since all the calculations are ratios - the only requirement is that, when units are used, they must all be the same (e.g. feet, centimeters, yards, meters, etc). Do not mix units in the calculations.
