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Make a loop at one end of a piece of
string.
At the other end, tie a pencil to the string.
Place the pencil upright on to the paper with one hand.
With the other hand, pull the string tight and hold the end firmly
against the paper.
You could use a thumbtack to anchor the string to the paper.
The string should be stretched straight and tight, or taut, between
the pencil and where it is held against the paper.
Move the pencil, keep the string as straight as you can at all
times.
You will find that the pencil moves in an arc shape and you begin
to construct a circle. At first you may experience some difficulty
because your arm may get in the way!
With a little practice, you will be able to draw perfect
circles.