A KEY TO ELEMENTARY TRIGONOMETRY BY J. HAMBLIN SMITH, M.A. OF GONVILLE AND CAIUS COLLEGE, and late lecturer at st. PETER'S COLLEGE, Cambridge PREFACE. I HAVE to acknowledge most gratefully the assistance rendered me in the preparation of this book by Mr. T. H. Gascoigne, son of the Rev. T. Gascoigne, of Spondon House School, Derby. For the solutions of a few of the Problems I am indebted to Mr. Gaskin's Trigonometrical Examples, and to Mr. Hymers' Trigonometry. I shall be glad to receive corrections of errors that may be discovered in my work. CAMBRIDGE, October 1876. ELEMENTARY TRIGONOMETRY. KEY. EXAMPLES-I. (pp. 1, 2). (1) 4 feet 6 inches=54 inches; .. number is 54. (2) 15 feet 2 inches = 182 inches; .. number is 182÷7, or, 26. (3) Unit of square measurement is (192÷12) square inches, or, 16 square inches ; .. unit of linear measurement is 16 inches, or, 4 inches. (4) Unit of square measurement is (1000÷40) square inches, or, 25 square inches; .. unit of linear measurement is 25 inches, or, 5 inches. (5) Unit of cubic measurement is (216÷8) cubic inches, or, 27 cubic inches; .. unit of linear measurement is 27 inches, or, 3 inches. (6) Unit of cubic measurement is (2000÷16) cubic inches, or, 125 cubic inches; ... unit of linear measurement is 125 inches, or, 5 inches. |