## Elementary Trigonometry |

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### Contents

measurement of angles | 1 |

Chapter HI relations between the ratios | 14 |

Trigonometrical Ratios of 45 60 30 | 28 |

47 other sections not shown

### Common terms and phrases

acute angle angle of elevation angles of depression antilog centesimal centre CHAPTER circle cos2 cos3 cos4 cosec cosine cot2 cotangent cyclic quadrilateral denote diff Draw equal expression Find log Find the angle find the distance find the height Find the number Find the value flagstaff following identities formula fraction given log graph Hence horizontal line hypotenuse integer LAOB lighthouse log0 magnitude mantissa miles minutes MISCELLANEOUS EXAMPLES negative number of radians numerical value observer obtain pedal triangle perpendicular positive Prove the following quadrant quadrilateral quantities radian measure radius vector regular polygon right angle right-angled triangle sec2 sexagesimal measure shew sin2 sin3 sin4 sine sine and cosine solution solve the triangle subtends an angle supplementary angles tan2 tangent tower triangle ABC trigono trigonometrical functions trigonometrical ratios whence yards