The book's page numbers are expressed by the sine value of that page number (if the page number measured degrees on a circle), e.g. -0.390731 (the last page) = sin(337°)

Introduction -- Going the distance -- A new angle -- Laws and orders -- Meshing about -- Well fit -- Where do shapes come from? -- Getting triggy with it -- Where on Earth? -- But is it art? -- Making waves -- Conclusion

"Trigonometry is perhaps the most essential concept humans have ever devised. The simple yet versatile triangle allows us to record music, map the world, launch rockets into space, and be slightly less bad at pool. Triangles underpin our day-to-day lives and civilization as we know it. Matt Parker argues we should all show a lot more love for triangles, along with all the useful trigonometry and geometry they enable. To prove his point, he uses triangles to create his own digital avatar, survive a harrowing motorcycle ride, cut a sandwich, fall in love, measure tall buildings in a few awkward bounds, and make some unusual art. Along the way, he tells extraordinary and entertaining stories of the mathematicians, engineers, and philosophers-starting with Pythagoras-who dared to take triangles seriously"--