Hi Lish, when you create a circle, you should see the label that says Radius: has a little arrow on it:



If you move your mouse over that label, you should see it kind of highlight like this:



If you then click on it, it will switch it to diameter mode instead of radius mode, so then you can type in the diameter instead of the radius:



That should make it easier for you to enter the diameter without doing any extra calculations. In the future I do want to support math expressions in those entry boxes as well.


It looks like your fixture has turned out well!

- Michael