I've got a box of clues. I could lend you a couple on what the introduction section is.Whats a matter dave you dont have a clue
:thumbsup: no need to be a rocket scientist unless of course your building an outdoor kitchen out of OSB and left over flea market partsI did it on my CAD program using a 3 point circle. 10' chord with a point in the middle 1' higher. My answer is accurate to a 1/4"
And first of all the arch on the pass through doesn't need to be precise anyway. You take a thin board and bend it and connect the three dots. If you need trim you make a template. Now if we were on an intergalactic space craft you might need the precise radius. Go fly a ship Manny.