IMPORTANT DEFINICIONS ABOUT CIRCLES

Cross hatching: it´s a way to give shade to a drawing.
Dashed: they are lines that are discontinuous.
Blurred: they are vanished  so they are hard to see.
Simple lines: they are shapes formed by only one line.Broken lines: they are formed by fragment of straight lines with different directions.
Wavy lines: they are fomed by curved linesComposite: they are lines  composed by several straight and curved lines.
Vertical lines: they express ascendant or descendant depending they are used.
Horizontal lines: they produce visual feeling of stabilityand tranquility.
Skew lines: they produce unsteadiness and movement feeling.
Curly lines: they show loops and has curved wavy lines.
Scribble lines: they are lines in every directions.
Hatching: it´s a way to give tones to objects or to surface with paralels lines.
Cross hatching: it´s a way to give shade to a drawing.
Dashed: they are lines that are discontinuous.
Blurred: they are vanished  so they are hard to see.
Simple lines: they are shapes formed by only one line.