This newest addition to the bestselling Skill Builders series, Trigonometry Success in 20 Minutes a Day helps students quickly and painlessly acquire practical skills in trigonometry through a series of simple, 20-step lesson plans. All key trigonometry topics are covered - from Pythagorean Theorem, the unit circle, and vectors to laws of sines and cosines, compound problems, and the Heron's Formula. Set up so that users can study the entire book or create a customized individual study plan, the book contains hundreds of practice exercises, without abstruse theorizing or jargon, that provide essential practice in solving trigonometry problems.