BOOK INTRODUCTIONAs trigonometry consists largely of formulae and applications thereof, the complete elementary textbook on Plane Trigonometry in Classic Text Series is compiled with a list of principle formulae, suitable for schools, higher studies. The book has endeavoured to present, as simply as possible, the modern treatment of complex quantities, large number of examples, and a section of questions to be solved by students. Worked examples and exercises with answers are also presented to identify gaps in understanding.BOOK STRUCTURE21 Chapters Miscellaneous Examples Answers Five-figure Logarithmic and Trigonometrical TablesBOOK KEY FEATURESThe modern treatment of complex quantities is presented in a simple manner A list of the principle formulae is included to easily memorize Abundance of examples are presented A section consisting of questions is to be solved by the students on a first reading Worked examples and exercises with answers will help to identify gaps in understandingWHY CHOOSE THIS BOOK?Must have book for all engineering entrance aspirants Suitable for schools and junior honour classes of universities Most preferred concept-building tool to learn mathematics Updated and deals with the modern treatment of complex concepts of Plane Trigonometry Theory and examples are compiled for an in-depth understanding of topicsTABLE OF CONTENTSMeasurement 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