ABOUT THE BOOK The "Classic Text Series" is a collection of books written by the most famous mathematicians of their time and has been proven over the years as the most preferred concept-building tool to learn mathematics. Arihant's imprints of these books are a way of presenting these timeless classics. Known as the early influencer on Ramanujan, SL LONELY was a great mathematician from 1800. The book "Plane Trigonometry" has been updated and deals with the modern treatment of complex concepts of Plane Trigonometry. Formulated as per the latest syllabus, this complete preparatory guide is compiled with detailed theories, Principle formulae, and a good collection of examples for an in- depth understanding of the concepts. The unique features accumulated in this book are: 1. Complete coverage of syllabus in 21 Chapters 2. A list of principle formulae for thorough revision 3. Important formulae are provided in the text 4. Enormous Examples for an in-depth understanding of topics 5. Works as an elementary textbook to build concepts 6. Chapterwise study, Answers, and Five-Figure Logarithmic and Trigonometrical Tables TABLE OF CONTENT: Measurement of angles; Sexagesimal and Centesimal Measure Circular or Radian, Measure, Trigonometrical Ratios for Angles Less Than A Right Angle values, Simple Problems In Height & Distance, Applications of Algebraic Signs to Trigonometry Tracing the Changes In The Ratios, Trigonometrical Ratios of Any Size & Sign, General Expressions for All Angles Having a Given Trigonometrical Ratio, Trigonometrical Ratios of The Sum & Difference Of Two Angles Product Formulae, Trigonometrical Ratios of Multiple and Submultiple Of Angles Explanation Of Ambiguities, Identities and Trigonometrical Equations, Logarithms, The Principle Of Proportional Parts, Relations Between Side &Trigonometrical Ratios Of The Angles Of A Triangle, Solution To Triangles, Heights & Distances, Properties Of A Triangle, Quadrilaterals, Trigonometrical Ratio, Inverse Circular Functions, Summation Of Some Simple Trigonometrical Series, Elimination, Projections, Miscellaneous Examples, Answers, Five-Figure Logarithmic And Trigonometrical Tables