In the 1900s farmers thought that their crops would grow taller of they were a certain pattern with the stars, nowadays people do it because of the UFO rumours and like to joke about with it.
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As many as the hoaxers feel like making.
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.