An Introduction to the Theory and Practice of Plain and Spherical Trigonometry: And the Stereographic Projection of the Sphere : Including the Theory of Navigation ...Longman, Rees, Orme, Brown, and Green, 1826 - 442 σελίδες |
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Σελίδα 17
... Miles of Longitude . Divide the line AC into 60 equal parts , through each of these draw lines a 10 ; b 20 , & c ... miles contained in one degree of longitude in that latitude , a degree at the equator being 60 miles . These lines are ...
... Miles of Longitude . Divide the line AC into 60 equal parts , through each of these draw lines a 10 ; b 20 , & c ... miles contained in one degree of longitude in that latitude , a degree at the equator being 60 miles . These lines are ...
Σελίδα 20
... miles . The first of these divisions is sometimes divided into 40 equal parts , each representing 15 miles . The extent from the brass pin on the scale of meridional parts to any division on that scale , applied to the line of equal ...
... miles . The first of these divisions is sometimes divided into 40 equal parts , each representing 15 miles . The extent from the brass pin on the scale of meridional parts to any division on that scale , applied to the line of equal ...
Σελίδα 57
... miles , then turning a little to the left hand goes from в to c , which is 47 miles : at che observes that A and B make an angle of 29 ° .16 ′ . What is the distance from A by the shortest cut ? Answer , 7 miles . 1 4. A man travels ...
... miles , then turning a little to the left hand goes from в to c , which is 47 miles : at che observes that A and B make an angle of 29 ° .16 ′ . What is the distance from A by the shortest cut ? Answer , 7 miles . 1 4. A man travels ...
Σελίδα 67
... miles , BC 7 miles , and AC 8 miles : at D , I took the angles CDB = 25 ° , and ADC = 19 ° . Hence it is required to find my distance from the objects . CONSTRUCTION . Make a triangle ABC whose three sides are 12 , 7 , and 8 ( P. 59 ) ...
... miles , BC 7 miles , and AC 8 miles : at D , I took the angles CDB = 25 ° , and ADC = 19 ° . Hence it is required to find my distance from the objects . CONSTRUCTION . Make a triangle ABC whose three sides are 12 , 7 , and 8 ( P. 59 ) ...
Σελίδα 68
... miles and DC = 16.3369 miles . V. In the triangle DEB the side BE and all the angles are given . Because the opposite angles of every quadrilateral in- scribed in a circle are equal to two right angles , the supple- ment of EAD ...
... miles and DC = 16.3369 miles . V. In the triangle DEB the side BE and all the angles are given . Because the opposite angles of every quadrilateral in- scribed in a circle are equal to two right angles , the supple- ment of EAD ...
Συχνά εμφανιζόμενοι όροι και φράσεις
acute Aldebaran angle CAB Answer apparent altitude azimuth base centre circle co-tangent compasses complement CONSTRUCTION cosec cosine degrees diff difference of latitude difference of longitude draw ecliptic equator Euclid find the angle formulæ given side greater Greenwich Hence horizon horizontal parallax hypoth hypothenuse less line of numbers line of sines log sine measured meridian miles moon's N.sine N.cos Naut Nautical Almanac noon North oblique observed obtuse opposite angle parallax parallel perpendicular plane sailing Plate pole prime vertical PROPOSITION quadrant Rad x sine rad2 radius rhumb line right angles right ascension right-angled spherical triangle RULE scale of chords scale of equal SCHOLIUM secant side AC sine A sine sine BC Sine Co-sine sphere spherical angle spherical triangle ABC star star's subtract sun's declination supplement tang tangent of half three angles three sides Trigonometry true altitude versed sine
Δημοφιλή αποσπάσματα
Σελίδα 21 - 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.
Σελίδα 2 - And if the given number be a proper vulgar fraction ; subtract the logarithm of the denominator from the logarithm of the numerator, and the remainder will be the logarithm sought ; which, being that of a decimal fraction, must always have a negative index.
Σελίδα 28 - The CO-SINE of an arc is the sine of the complement of that arc as L.
Σελίδα 107 - 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.
Σελίδα 31 - An angle at the circumference of a circle is measured by half the arc that subtends it. Let BAC be an angle at the circumference : it has for its measure half the arc "BC, which subtends it.
Σελίδα 136 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.
Σελίδα 258 - The HORIZON is a great circle which separates the visible half of the heavens from the invisible ; the earth being considered as a point in the centre of the sphere of the fixed stars.
Σελίδα 28 - The SECANT of an arc, is a straight line drawn from the center, through one end of the arc, and extended to the tangent which is drawn from the other end.
Σελίδα 27 - The sine, or right sine, of an arc, is the line drawn from one extremity of the arc, perpendicular to the diameter passing through the other extremity. Thus, BF is the sine of the arc AB, or of the arc BDE.