Final answer:
The question pertains to Physics, specifically to a measurement technique called parallax used in surveying to determine distances to inaccessible objects. The technique involves observing the apparent change in direction of the object from two different points and using trigonometry to calculate the distance.
Step-by-step explanation:
The question refers to measuring a distance using a parallax method, which is a concept from Physics. When you place the "Line of Fire" Arrow toward the curbside of the Land Survey (LS), you are taking a measurement that likely involves establishing a baseline and then observing angles or directions from two different points to determine the position or distance to an object. This technique relies on the principle of parallax, where the apparent change in direction of a remote object is observed from two distinct vantage points to calculate distances. In surveying, this technique is used to measure distances in situations where direct measurement is difficult or impossible, such as across a river or a gully.
Parallax measurements can be used to determine the width of a river, the height of a tree, or the distance to any object that is not readily accessible for direct measurement. Surveyors often use instruments like theodolites to measure angles accurately, which can then be used along with the baseline distance to calculate the distance to the object using trigonometry. Ensuring that measurements are taken precisely is critical for accurate results, which is why surveyors must have a solid understanding of both geometry and trigonometry principles.