orthographic drawing is a drawing that communicates the shape and size of an object through a series of related two-dimensional views.
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How can define A and D Or A 4B 2D?
In Geometry, lines go on to infinity in both directions. This is why arrows are used. The two letters, E and F define that line. Of course if you were to measure the distance from E to F, that would be a line segment or part of the line.
diameter
No. A plane is infinite.
It depends on how you define "ways" and how you define "lines" and how you define "intersect" and what kind of geometry you're talking about, but in Euclidean geometry, lines either never intersect, or they intersect at a single point, or they can intersect at all points within the lines.