A margain could be drawn on any edge of a paraghraph.
Border
wall
If you draw a line from the center of a circle to the edge of a circle, you have drawn the radius of the circle. If you draw a line from the edge of a circle through the center of the circle and on to the edge on the opposite side, you have drawn the diameter of a circle. The radius of a circle is one half the diameter of a circle.
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They meet at an edge
a solid line at the edge of a paragraph.
Border
A separator or a horizontal line.
The answer is border.
The line that forms the edge of a figure is an edge line. Which forms the figure the has been drawn. You use this line to define a drawing or a figure.
contour line
contour line
The edge is a line - straight or curved - where two faces of the solid meet.
Its perimeter
outline
outline
An edge is a line at which two faces of the solid meet.