Solid Geometry

*Solid Geometry* by George Wentworth and David Eugene Smith is a classic textbook that provides a rigorous and accessible introduction to three-dimensional geometry for high school and early college students. It covers key topics such as planes, lines in space, polyhedra, prisms, pyramids, cylinders, cones, and spheres, with a strong emphasis on logical reasoning and geometric proofs. The text is carefully structured, beginning with foundational concepts and building toward more complex theorems, all supported by clear diagrams and exercises. Its thoughtful pedagogy and precise language make it a timeless resource for developing spatial understanding and geometric thinking.