If the PDF you find solves problem #47 cleanly with a diagram, you have found a gold standard resource.
The methodology espoused in texts like Plane Euclidean Geometry encourages the following approaches: Plane-Euclidean-Geometry-Theory-And-Problems-Pdf-Free-47
Solving for unknown angles using parallel line properties or basic triangle sums. If the PDF you find solves problem #47
The search string is more than a random collection of keywords. It is a mission statement: you want complete, structured, cost-free access to the 47 essential concepts and problems that form the bedrock of planar geometry. Plane-Euclidean-Geometry-Theory-And-Problems-Pdf-Free-47