## A Treatise on Plane and Spherical Trigonometry: With Their Most Useful Practical Applications |

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A Treatise on Plane and Spherical Trigonometry: With Their Most Useful ... John Bonnycastle No preview available - 2014 |

### Common terms and phrases

acute adjacent angle Aldebaran altitude ambiguous azimuth centre comp complement cosec cosine describe a circle diff difference distance draw the diameters ecliptic equal equation Example extent will reach find the rest former given leg given side greater than 90 Greenwich height horizon hypothenusal angle latitude less than 90 Log sine logarithms longitude measured meridian moon’s oblique oblique-angled spherical triangle observed obtuse opposite angle parallax perpendicular plane triangle points pole quadrantal spherical triangle radius required to find right ascension right-angled spherical triangle RULE scale of chords secant secē semitangent side A B sides and angles sin a sin sines sphere spherical triangle A B C spherical trigonometry star subtracted sun's declination sun’s supplement tables tangents THEOREM three angles three sides trigonometry whence

### Popular passages

Page 1 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.

Page 9 - ... for the second term, and the greater for the first ; and in either case multiply the second and third terms together, and divide the product by the first for the answer, which will always be of the same denomination as the third term.

Page 352 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.

Page 388 - The sum of any two sides of a spherical triangle is greater than the third side, and their difference is less than the third side.

Page vii - The rectangle contained by the diagonals of a quadrilateral inscribed in a circle is equal to the sum of the two rectangles contained by its opposite sides.

Page 17 - To find the other side: — as the sum of the two given sides is to their difference, so is the tangent of half the sum of their opposite angles to the tangent of half their difference...

Page 20 - As the base or sum of the segments Is to the sum of the other two sides, So is the difference of those sides To the difference of the segments of the base.

Page 8 - C 76° 45i'. 2. Given the three sides 58, 39, and 46 ; to find the angles. 173. Any right lined figure whatever, whose sides and angles are given, may be constructed, by laying down the sides from a scale of equal parts, and the angles from a line of chords. Ex. Given the sides AB (Fig.

Page 3 - Sine, or Right Sine, of an arc, is the line drawn from one extremity of the arc, perpendicular to the diameter which passes through the other extremity. Thus, BF is the sine of the arc AB, or of the supplemental arc BDE.

Page 411 - From the logarithm of the area of the triangle, taken as a plane one, in feet, subtract the constant log 9-3267737, then the remainder is the logarithm of the excess above 180°, in seconds nearly.* 3.