A line that follows the edge of form is a contour line. This type of art is called contour drawing. Doing it without looking at the paper is called blind contour drawing.
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An edge is a straight line as part of a polygon. It can also be the straight line joining two faces of a solid which has polygonal faces.
edge?
This line is called a radius.
A segment is part of a circle created by drawing a line from a point on the edge to another point on the edge.
Isn't it the radii?