Imagine you are a construction estimator working on a project that involves pouring concrete for a multi-level building foundation. The architectural plans reveal variations in concrete thickness, slopes, and irregular shapes across different sections of the foundation. As an estimator, you need to accurately estimate the concrete quantity required for the entire project. How would you identify and analyze the areas with variations in concrete thickness, slopes, and irregular shapes from the architectural plans? How do these variations impact the overall concrete quantity estimation