You don't need to trace a soup can in order to draw a perfect circle. All you really need—even if you're drawing freehand—is a pencil and a piece of paper. The trick to it involves spinning the paper and keeping your hand as steady as possible. Watch how it's done in the video below.
How to Draw a Perfect Circle Freehand
It even works for differently sized circles!
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Key Facts In This Video
Learn how to draw a large freehand circle: 00:10
To draw a medium-sized circle, pivot your paper on one of your knuckles. 00:31
To avoid making darker and lighter patches on your freehand circle, draw it with a pencil or a ballpoint pen. 00:47
Doodling In Math
There's art in math, namely in spirals and the Fibonacci sequence.