3 or less 2. Line A is 10 feet away. Line B is 20 feet away. Shorter than 2. The same length as 3.
Perspective projection is simply a division by depth.
In an orthographic projection 1. Points on an object are projected to the viewing plane along parallel lines 2. Compare and contrast axonometric projections and isometric projections in a projection categorization tree. Axonometric is a parent of isometric 2. They are siblings 3.