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Mar 1, 2016 at 21:09 comment added Stephie If your disk is small enough you can even use your stretched fingers (e.g. thumb and pinkie) to first "grab" the radius and then "walk" along the edge, like you would with a compass.
Oct 26, 2015 at 13:42 history edited Robert Cartaino CC BY-SA 3.0
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Oct 26, 2015 at 1:28 history edited Robert Cartaino CC BY-SA 3.0
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Oct 25, 2015 at 17:49 comment added ChrisWue Nice idea since it works with other round things as well - like cakes.
Oct 25, 2015 at 15:56 history answered Robert Cartaino CC BY-SA 3.0