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...