The Elements of Plane and Spherical Trigonometry ... |
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عبارات ومصطلحات مألوفة
altitude angle being given angle of depression angle of elevation azimuth Cape Cape Clear Cape Race circle Colatitude Cosec Cosine Cotangent CP CP Diff equal equation Examples for Practice find side find the angle find the area find the distance find the height find the latitude find the sides Find the value flagstaff formula Given Log greater than 90 Haversine headlands horizontal plane hour angle included angle latitude 50 lighthouse Logarithms longitude meridian miles negative observes the angle perp perpendicular place in latitude prime vertical required the distance right angles right-angled triangle Secant ship sides are given sine spherical triangle Spherical Trigonometry station subtracted from 180 Sun's altitude Sun's declination Tangent tower trigonometrical ratios Vers Versine Vertex yards دو وو
مقاطع مشهورة
الصفحة 85 - IF a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles ; and the three interior angles of every triangle are equal to two right angles.
الصفحة 85 - The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles.
الصفحة 75 - To raise a number to any power, multiply the Log. of the number by the index of the power; the result will be the Log.
الصفحة 62 - Suppose a* =n, then x is called the logarithm of n to the böge a ; thus the logarithm of a number to a given base is the index of the power to which the base must be raised to be equal to the number. The- logarithm of n to the base a is written Iog0 n ; thus log„ii = a; expresses the same relation, as a* = n.
الصفحة 85 - IF a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another; and the exterior angle equal to the interior and opposite upon...
الصفحة 40 - The sides of a triangle are proportional to the sines of the opposite angles.
الصفحة 72 - See the table at the end of this number. To find from the table the length of any given number of degrees and minutes, look for the degrees at the top of the page, and the minutes on the side; then against the minutes, and under the degrees, will be the length of the arc in nautical miles. 67. Meridional Difference of Latitude. — An arc of Mercator's meridian contained between two parallels of latitude, is called meridional difference of latitude. It is found by subtracting...
الصفحة 53 - The RADIUS of a sphere is a straight line drawn from the centre to any point in surface, as the line C B.
الصفحة 41 - 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.
الصفحة 76 - Divide the logarithm of the number by the index of the root; the result will be the logarithm of the root. EXAMPLE.— Extract (a) the square root of 77,851; (6) the cube root of 698,970; (c) the 2.4 root of 8,964,300.