What if you need to draw a circle, and a compass at hand is not! To get out of this situation by making a simple compass of the bent and strapped to the pencil in the right place for a stylus pen, as shown in the figure.
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Today is a difficult time, many live by the principle: "necessity is the mother of invention". Not enough money, we have to get out, remembering or inventing all sorts of homemade...
