- Evil spirits can't harm you when you are standing inside a circle
- Also, the number 0 is seen as the number of infinity, as it never ends. The same principle can be applied to a circle
another superstition is crop circle on Halloween (night of souls) in dark ages people believed that standing in a circle could some how summon the dead spirits trapped in this world!
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long tradition
Yes. The circles can be of different size. These are called concentric circles.
concentric circles
A cylinder has two circles as its bases.
Tangent circles are circles that touch one another without crossing. The distance between the centres of the circles must be equal to the difference or the sum of their radii.