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A great book that captures geometry in its beauty. An abundance of critical thinking because it is one of a kind. Dihedral angle proofs, similar triangle proofs involving circles, story problems. Numerous applications with proportion relating to scale drawings of models, finding the altitude of a tree or building with similar triangles. If one wants to be self-taught and has a desire to truly learn geometry in its true form, I recommend this book. This book should be salvaged for generations as a tool for an honors geometry course in high schools across the globe because geometry sparks interest in future engineering , math , and science majors