A Geometric–Differential Method for Determining an Unknown Angle from a Trigonometric Ratio

This project presents a geometric–differential approach for estimating an unknown angle from a trigonometric ratio. The method combines classical geometric intuition with a linearization‑based differential correction, resulting in an iterative refinement process that approximates the target angle without relying on inverse trigonometric functions. The project includes two versions of the paper (English and Italian), along with supporting materials. All files are openly accessible, and the work is archived with a DOI for long‑term preservation and citation.