Why is planar measurement not suitable for large areas?

Planar measurement is fundamentally based on a flat, two-dimensional surface. This method works well for small areas where the curvature of the Earth can often be disregarded. However, as the area of measurement increases, the curvature of the Earth becomes more significant. Since the Earth is not flat but rather an oblate spheroid, the inaccuracies introduced by ignoring this curvature grow larger when dealing with large areas. Thus, planar measurement fails to yield precise results for extensive regions, making it unsuitable for large-scale applications where accurate geospatial representation is crucial.

The other choices do not accurately define the limitations of planar measurement in the context of large areas. The first option about specific tools does not pertain to the fundamental reason for the unsuitability of planar measurement for large areas. The mention of advanced mathematical knowledge is irrelevant here, as the current issue pertains to geometric properties rather than the complexity of the tools used. Lastly, the notion that planar measurement is only theoretical does not encapsulate the practical limitations imposed by Earth's geometry.