Trigonometry Success in 20 Minutes a Day

Introduction ix Pretest 1(20) Lesson 1 Angles 21(6) Lesson 2 Triangles 27(10) Lesson 3 Pythagorean Theorem 37(12) Lesson 4 Functions 49(8) Lesson 5 Sine 57(10) Lesson 6 Cosine 67(8) Lesson 7 Tangent 75(8) Lesson 8 Secant, Cosecant, and Cotangent 83(10) Lesson 9 Nice Triangles 93(6) Lesson 10 The Unit Circle 99(12) Lesson 11 Nice Angles 111(10) Lesson 12 Calculator Trigonometry 121(8) Lesson 13 Finding Lengths 129(8) Lesson 14 Inverse Functions 137(8) Lesson 15 Finding Angles 145(6) Lesson 16 Vectors 151(10) Lesson 17 The Law of Sines 161(12) Lesson 18 The Law of Cosines 173(12) `Lesson 19 Heron's Formula 185(8) Lesson 20 Advanced Problems 193(8) Posttest 201(20) Answer Key 221(32) Glossary 253