Title: An Elementary Treatise on Plane Trigonometry
Description: Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb.
Subjects: sin, cos, tan, angle, log, angles, cot, prove, triangle, trigonometrical, trigonometrical ratios, circular measure, angle subtended, find sin, trigonometrical ratio, triangle abc, horizontal plane, middle point, inscribed circle, find cos