Elements of Plane and Spherical Trigonometry: With Numerous Examples

3d quadrant acute angle algebraically ambiguity angle AOP angle of elevation angles of depression centre circle circular measure cliff colog cos a cos cos a sin cos² cosb cosec cosine cotangent denote distance equal equation EXAMPLES express feet high find the height formulæ geometrically Given a side Given the three Given two sides Hence horizontal plane hypotenuse included angle Let ABC log cot log sin logarithms Napier's Rules negative oblique triangles observed opposite angle perpendicular polar triangle positive Prove the following quadrantal triangle radian radius respectively right angle right triangle secant Sexagesimal Similarly sin A cos sin b sin sin x sin² siny solution of triangles spherical triangle SPHERICAL TRIGONOMETRY subtends tan-¹ tan² tan²x tangent three angles three sides tower triangle ABC trigonometric functions yards ОР