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Isocircles

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notredave:
Good morning,

I am having a time trying to get an ellipse-->isocircle in isodraft to give me the correct diameter when I do a distance between quadrants. For example, if I draw an isocircle with a diameter of 1" and dimension it, it gives 1.2247" across quadrants. Is there a way to draw an isocircle with diameter inputted to output correct diameter when dimensioning it?

Thank you,
Dave

Crank:
It's just math (in radians)
If you draw a circle with radius=1 and add some lines and angles, we get:

--- Code: ---(setq Rmin (cos (* pi .25)))
(setq Rmax (* Rmin (sqrt 3.)))

--- End code ---
So:

--- Code: ---(setq Rmin (* 0.5 (sqrt 2.)))
(setq Rmax (* 0.5 (sqrt 6.)))

--- End code ---

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