Answer :
Final answer:
3) Visible line. In orthographic projection, a visible line is a type of surface on the object that projects as an edge on the profile image plane and appears foreshortened on the horizontal and frontal image planes.
Explanation:
In orthographic projection, a type of surface on the object that projects as an edge on the profile image plane and appears foreshortened on the horizontal and frontal image planes is known as a visible line.
Orthographic projection is a technique used to represent three-dimensional objects on a two-dimensional surface, such as a drawing or a plan. It uses multiple image planes to show different views of the object, including profile, top, front, and side views. In orthographic projection, visible lines are the ones that represent the edges of the object that are visible in the different views.
For example, let's say we have a cube. In the profile image plane, two of the cube's surfaces will project as visible lines, as they are visible from that particular view. However, in the horizontal and frontal image planes, those surfaces will appear foreshortened and will be represented as shorter lines.
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