## Plane and Spherical Trigonometry |

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### Common terms and phrases

acute angle adapted to logarithmic altitude celestial horizon celestial sphere check formula circle of latitude Circular Functions colog complement cosecant cosine cosqp cotangent ctn A ctn ctn qp denote distance ecliptic equator esc qp Example feet figures find the angle find the functions find the height formulas four-place functions of 90 Geometry given angle given logarithm horizon hypothenuse initial line interpolation IOOO'O less than 180 log ctn log esc log sin logarithmic computation Logarithms of Circular miles negative obtained perpendicular Plane Trig polar triangle positive Prove quadrant radius right angle right ascension right triangle sec qp secant sin a sin sin2 sine and cosine solution solve spherical triangle Spherical Trigonometry Table of Logarithms tabulated tan2 tana tangent terminal line triangle of reference trigonometric functions vernal equinox

### Popular passages

Page 44 - Its peculiarities are the rigorous use of the Doctrine of Limits, as a foundation of the subject, and as preliminary to the adoption of the more direct and practically convenient infinitesimal notation and nomenclature ; the early introduction of a few simple formulas and methods for integrating ; a rather elaborate treatment of the use of infinitesimals in pure geometry ; and the attempt to excite and keep up the interest of the student by bringing in throughout the whole book, and not merely at...

Page 91 - From a station B at the base of a mountain its summit A is seen at an elevation of 60°; after walking one mile towards the summit up a plane making an angle of 30° with the horizon to another station C, the angle BCA is observed to be 135°.

Page 20 - ... cos a = cos b cos с + sin b sin с cos A ; (2) cos b = cos a cos с + sin a sin с cos в ; ^ A. (3) cos с = cos a cos b + sin a sin b cos C.

Page 73 - In any triangle, the square of the side opposite an acute angle is equal to the sum of the squares of the other two sides, minus twice the product of one of these sides and the projection of the other side upon it.

Page 46 - By [2]. [18]. and [19]. we have. — sin (a ± ß) sin a cos ß ± cos a sin ß cos (a ± ß) cos acoeß Т sin a sin ß Divide both numerator and denominator by cos a cos |3.

Page 69 - Having measured a distance of 200 feet, in a direct horizontal line, from the bottom of a steeple, the angle of elevation of its top, taken at that distance, was found to be 47° 30'; from hence it is required to find the height of the steeple.

Page 44 - Mailing price, 55 cents ; for introduction, 50 cents. rPHE design of the author has been to give to students a more complete and accurate knowledge of the nature and use of Logarithms than they can acquire from the cursory study commonly bestowed on this subject.