A Treatise on Elementary Trigonometry

1+tan A+tan algebraical angle of elevation angle ROP angular arithmetical base centre chains circular measure circumference circumscribed circumscribed circles common logarithms cos² cos³ cosec cosine decimal described diameter distance distant object Draw PM equal escribed circles Express find log Find the angle Find the height Find the length Find the number formulæ fraction geometrically given that log Hence horizontal hypotenuse inches inscribed isosceles triangle L sin less Let ROP magnitude miles negative number of degrees observed perimeter perpendicular positive Prove the following Quadrant radians radius regular polygon respectively revolving line right angle right-angled triangle sec² Sextant sides significant figures sin² sin³ sine Solve the equation square student tan² tangent telescope Theodolite tower Trace the changes triangle ABC Trigono Trigonometrical Ratios vernier yards