Simple, it it is a true barrel simple find the measurement from inside to inside of your barrel and divide by 2. IF it is not a perfect half circl barrel or true barrel, simple find your chord (measurement inside to inside) and find your rise. Once you have these measurements you can use your diameter formula to figure the radius
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What advantages did the Romans find in using a cross vault instead of a barrel vault?
The next clue to the treasure's location is safely hidden- in that locked vault! I would like very much to see you vault over the next obstacle.
Don't read this if you didn't read Harry Potter.... The Sorcerer's Stone is in Vault Seven Hundred and Thirteen.
. Ogive
Another word for crypt is mausoleum or vault.