An arch made of 2" dia tube

I am trying to draw a basic green house whose frame is made from 2" diameter pipe. 40" of the side wall is made from straight pipe (easily made) but the top section is made of arches made of the 2" pipe. I can draw an arch with a line tool and arch tool, but haven’t a clue how to give that arch dimension.

Use the follow me tool.


As @slbaumgartner says…

See this training video: