Plane Trigonometry

ude as negative; eastern longitude as positive, western longitude as negative; a credit balance as positive, a debit balance as negative; altitude above sea level as positive, altitude below sea level as negative, etc.2. Points on a line. Directed lines. A simple graphical representation of such magnitudes is obtained by means of a straight line, called the axis, upon which are indicated a fixed point, called the origin, a unit distance and a positive direction.O (Origin) 1 Table of Contents 1 Directed magnitudes 1; 2 Points on a line Directed Jines 1; 3, 4 Points in a plane 2; 5 A fundamental theorem 3; 6, 7 Projections of line segments 4; 8, 9 Directed angles _ 5; 10, 11 Radian measure 6; CHAPTER II; THE TRIGONOMETRIC RATIOS SIMPLE IDENTITIES; 12, 13 Standard position 9; 14-17 Trigonometric ratios 9; 18, 19 Reduction to the first quadrant 11; 20 Ratios of acute angles , 13; 21, 22 Ratios of 30°, 60°, and 45° 13; 23 Ratios of 90°, 180 °, 270 °, and 360° 15; 24, 25 Trigonometric functions 16; 26 Periodicity 17; 27, 28 Relations between the trigonometric functions 18; CHAPTER III LOGARITHMS; 29 Theory of exponents 20; 30 The use of exponents in calculation 21; 31, 32 Definition of logarithms 21; 33, 34 Fundamental theorems on logarithms 22; 35 Common logarithms 24; 36, 37 Use of a table of logarithms 26; 38, 39 Calculation by means of logarithms 28; 40, 41 The right triangle 32; 42 Accuracy of the c