The dome calculator located here is grate ! But I have a few questions . Are the answeres and values in feet? and volumes in cubic feet? http://www.monolithic.com/plan_design/calcs/

Also I am wondering about shallow domes . Like If I enter 30 dia and a 5 foot height I see a Radius of Curvature value of 25 . I dont quite get that . What would this dome look like ? I was hopeing for a thin-ish saucer shape like this ) But the 25 just dosen't fit in . It seems that the Radius of Curvature would be much larger, something like 100 with a compass point way below the floor line to span 30 ft and only 5 ft high. What am I not seeing? Thanks for any help .