Plane trigonometry with practical applications, by Leonard E. Dickson.

CONTENTS
CHAPTER I
Trigonometric Functions of Acute Angles
ARTICLE PAGB
1. Nature of Trigonometry........... 1
2. Drawings to scale........ 1
3. Absolute and relative errors.... 3
4. Horizontal and vertical lines, planes, angles.. 4
5. Angles of elevation and depression.... 5
6. Illustrations of the tangent of an acute angle... 5
7. Definitions of the trigonometric functions of an acute angle. 6
8. Problems on heights and distances... 9
9. Given one trigonometric function, to find the others.. 11
10. Relations between the six trigonometric functions of an acute
angle....... 12
11. Further formulas true for every acute angle.... 14
12. Relations between the functions of complementary angles. 16
CHAPTER II
Solution of Right Triangles by Means of Tables of the Natural Functions
13. How to use tables of natural functions....... 19
14. Solution of right triangles by means of tables of natural
functions... 21
15. Cases when an angle cannot be accurately found by Table II 23
CHAPTER III
Traverse Table; Solution of Right Triangles by Inspection; Problems on
Forces and Refraction of Light
16. Description of Traverse Table VI...... 26
17. When and how to use Traverse Table VI.... 26
Exercises on heights and distances..... 28
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