Also from the authors:

Make: Geometry helps students learn key topics from middle- and high-school geometry through 3D printing and other hands-on projects. Geometry, of all the branches of mathematics, is the one that is most easily visualized by making something. However, it is all too easy to reduce it to reams of formulas to memorize and proofs to replicate. This book takes geometry back to its practical roots with applications like determining latitude and longitude with just a watch and some observations of the sun. The book also teaches how to use the free CAD program OpenSCAD, which uses computer code to describe objects. Models in the book can be expanded to make an elaborate castle, or for readers to explore concepts on their own.