Final answer:
To find the perpendicular distance from point A using mathematics, one would often use the Pythagorean theorem or trigonometric functions depending on the given information, such as a diagram or the slope of the existing line.
Step-by-step explanation:
To find the distance from point A that would make a new line perpendicular to a given line and round it to the nearest tenth, we need to use principles of trigonometry and geometry. The initial instruction seems to suggest that this problem is part of a larger context where distances can be estimated using an empirical method based on the human visual perception of parallax and proportions. For the mathematical approach, we would typically use the Pythagorean theorem or trigonometric ratios depending on the information given. If a diagram is provided, the trigonometric functions like sine, cosine, or tangent could be used to find the perpendicular distance. Without a diagram, we can use the principle that the product of the slopes of two perpendicular lines is -1. Therefore, if we have the slope of the given line, we can find the slope of the perpendicular line and then use the distance formula to find the exact length.