This vintage book contains a comprehensive guide to trigonometry. Trigonometry (from Greek trigonon, "triangle" and metron, "measure") is a branch of mathematics that studies relationships involving lengths and angles of triangles. The field emerged in the Hellenistic world during the third century BCE, from applications of geometry to astronomical studies. This timeless guide is designed with the trigonometry novice in mind, and contains a wealth of useful exercises and step-by-step explanations. It is ideal for those looking to gain a good understanding of trigonometry, and will also be of interest to collectors of antiquarian literature of this ilk. Many vintage texts such as this are increasingly scarce and expensive, and it is with this in mind that we are republishing this volume now, in an affordable, high-quality, modern edition. It comes complete with a specially commissioned biography of the author.